diff --git a/Question_21_30/README.md b/Question_21_30/README.md
index e639c5a6..bb495547 100644
--- a/Question_21_30/README.md
+++ b/Question_21_30/README.md
@@ -25,12 +25,12 @@ xout = {  a                         (xin < c)
 ```
 -->
 
-|入力 (imori_dark.jpg)|出力 (answers/answer_21_1.jpg) |ヒストグラム(answers/answer_21_2.png)|
+|入力 (imori_dark.jpg)|出力 (answers_image/answer_21_1.jpg) |ヒストグラム(answers_image/answer_21_2.png)|
 |:---:|:---:|:---:|
-|![](imori_dark.jpg)|![](answers/answer_21_1.jpg)|![](answers/answer_21_2.png)|
+|![](imori_dark.jpg)|![](answers_image/answer_21_1.jpg)|![](answers_image/answer_21_2.png)|
 
 答え 
-- Python >> [answers/answer_21.py](answers/answer_21.py)
+- Python >> [answers_py/answer_21.py](answers_py/answer_21.py)
 - C++ >> [answers_cpp/answer_21.cpp](answers_cpp/answer_21.cpp)
 
 ## Q.22. ヒストグラム操作
@@ -49,12 +49,12 @@ xout = s0 / s * (xin - m) + m0
 ```
 -->
 
-|入力 (imori_dark.jpg)|出力 (answers/answer_22_1.jpg) |ヒストグラム(answers/answer_22_2.png)|
+|入力 (imori_dark.jpg)|出力 (answers_image/answer_22_1.jpg) |ヒストグラム(answers_image/answer_22_2.png)|
 |:---:|:---:|:---:|
-|![](imori_dark.jpg)|![](answers/answer_22_1.jpg)|![](answers/answer_22_2.png)|
+|![](imori_dark.jpg)|![](answers_image/answer_22_1.jpg)|![](answers_image/answer_22_2.png)|
 
 答え 
-- Python >> [answers/answer_22.py](answers/answer_22.py)
+- Python >> [answers_py/answer_22.py](answers_py/answer_22.py)
 - C++ >> [answers_cpp/answer_22.cpp](answers_cpp/answer_22.cpp)
 
 ## Q.23. ヒストグラム平坦化
@@ -76,12 +76,12 @@ Z' = Zmax / S * Sum{i=0:z} h(z)
 ```
 -->
 
-|入力 (imori.jpg)|出力 (answers/answer_23_1.jpg) |ヒストグラム(answers/answer_23_2.png)|
+|入力 (imori.jpg)|出力 (answers_image/answer_23_1.jpg) |ヒストグラム(answers_image/answer_23_2.png)|
 |:---:|:---:|:---:|
-|![](imori.jpg)|![](answers/answer_23_1.jpg)|![](answers/answer_23_2.png)|
+|![](imori.jpg)|![](answers_image/answer_23_1.jpg)|![](answers_image/answer_23_2.png)|
 
 答え 
-- Python >> [answers/answer_23.py](answers/answer_23.py)
+- Python >> [answers_py/answer_23.py](answers_py/answer_23.py)
 - C++ >> [answers_cpp/answer_23.cpp](answers_cpp/answer_23.cpp)
 
 
@@ -118,12 +118,12 @@ Iout = (1/c * Iin) ^ (1/g)
 
 ![](question_24_1.jpg) ![](question_24_2.jpg)
 
-|入力 (imori_gamma.jpg)|出力 (answers/answer_24.jpg)|
+|入力 (imori_gamma.jpg)|出力 (answers_image/answer_24.jpg)|
 |:---:|:---:|
-|![](imori_gamma.jpg)|![](answers/answer_24.jpg)|
+|![](imori_gamma.jpg)|![](answers_image/answer_24.jpg)|
 
 答え 
-- Python >> [answers/answer_24.py](answers/answer_24.py)
+- Python >> [answers_py/answer_24.py](answers_py/answer_24.py)
 - C++ >> [answers_cpp/answer_24.cpp](answers_cpp/answer_24.cpp)
 
 ## Q.25. 最近傍補間
@@ -144,12 +144,12 @@ I'(x,y) = I([x/a], [y/a])
 ```
 -->
 
-|入力 (imori.jpg)|出力 (answers/answer_25.jpg)|
+|入力 (imori.jpg)|出力 (answers_image/answer_25.jpg)|
 |:---:|:---:|
-|![](imori.jpg)|![](answers/answer_25.jpg)|
+|![](imori.jpg)|![](answers_image/answer_25.jpg)|
 
 答え 
-- Python >> [answers/answer_25.py](answers/answer_25.py)
+- Python >> [answers_py/answer_25.py](answers_py/answer_25.py)
 - C++ >> [answers_cpp/answer_25.cpp](answers_cpp/answer_25.cpp)
 
 ## Q.26. Bi-linear補間
@@ -184,12 +184,12 @@ I'(x',y') = (1-dx)(1-dy)I(x,y) + dx(1-dy)I(x+1,y) + (1-dx)dyI(x,y+1) + dxdyI(x+1
 ```
 -->
 
-|入力 (imori.jpg)|出力 (answers/answer_26.jpg)|
+|入力 (imori.jpg)|出力 (answers_image/answer_26.jpg)|
 |:---:|:---:|
-|![](imori.jpg)|![](answers/answer_26.jpg)|
+|![](imori.jpg)|![](answers_image/answer_26.jpg)|
 
 答え 
-- Python >> [answers/answer_26.py](answers/answer_26.py)
+- Python >> [answers_py/answer_26.py](answers_py/answer_26.py)
 - C++ >> [answers_cpp/answer_26.cpp](answers_cpp/answer_26.cpp)
 
 ## Q.27. Bi-cubic補間
@@ -244,12 +244,12 @@ I'(x', y') = (Sum{i=-1:2}{j=-1:2} I(x+i,y+j) * wxi * wyj) / Sum{i=-1:2}{j=-1:2}
 ```
 -->
 
-|入力 (imori.jpg)|出力 (answers/answer_27.jpg)|
+|入力 (imori.jpg)|出力 (answers_image/answer_27.jpg)|
 |:---:|:---:|
-|![](imori.jpg)|![](answers/answer_27.jpg)|
+|![](imori.jpg)|![](answers_image/answer_27.jpg)|
 
 答え 
-- Python >> [answers/answer_27.py](answers/answer_27.py)
+- Python >> [answers_py/answer_27.py](answers_py/answer_27.py)
 - C++ >> [answers_cpp/answer_27.cpp](answers_cpp/answer_27.cpp)
 
 ## Q.28. アフィン変換(平行移動)
@@ -311,12 +311,12 @@ I'(x', y') = (Sum{i=-1:2}{j=-1:2} I(x+i,y+j) * wxi * wyj) / Sum{i=-1:2}{j=-1:2}
 ```
 -->
 
-|入力 (imori.jpg)|出力 (answers/answer_28.jpg)|
+|入力 (imori.jpg)|出力 (answers_image/answer_28.jpg)|
 |:---:|:---:|
-|![](imori.jpg)|![](answers/answer_28.jpg)|
+|![](imori.jpg)|![](answers_image/answer_28.jpg)|
 
 答え 
-- Python >> [answers/answer_28.py](answers/answer_28.py)
+- Python >> [answers_py/answer_28.py](answers_py/answer_28.py)
 - C++ >> [answers_cpp/answer_28.cpp](answers_cpp/answer_28.cpp)
 
 ## Q.29. アフィン変換(拡大縮小)
@@ -325,12 +325,12 @@ I'(x', y') = (Sum{i=-1:2}{j=-1:2} I(x+i,y+j) * wxi * wyj) / Sum{i=-1:2}{j=-1:2}
 
 また、(2)  (1)の条件に加えて、x方向に+30、y方向に-30だけ平行移動を同時に実現せよ。
 
-|入力 (imori.jpg)|出力 (1) (answers/answer_29_1.jpg)|出力 (2) (answers/answer_29_2.jpg)|
+|入力 (imori.jpg)|出力 (1) (answers_image/answer_29_1.jpg)|出力 (2) (answers_image/answer_29_2.jpg)|
 |:---:|:---:|:---:|
-|![](imori.jpg)|![](answers/answer_29_1.jpg)|![](answers/answer_29_2.jpg)|
+|![](imori.jpg)|![](answers_image/answer_29_1.jpg)|![](answers_image/answer_29_2.jpg)|
 
 答え 
-- Python >> [answers/answer_29.py](answers/answer_29.py)
+- Python >> [answers_py/answer_29.py](answers_py/answer_29.py)
 - C++ >> [answers_cpp/answer_29.cpp](answers_cpp/answer_29.cpp)
 
 ## Q.30. アフィン変換(回転)
@@ -352,12 +352,12 @@ I'(x', y') = (Sum{i=-1:2}{j=-1:2} I(x+i,y+j) * wxi * wyj) / Sum{i=-1:2}{j=-1:2}
 ```
 -->
 
-|入力 (imori.jpg)|出力 (1) (answers/answer_30_1.jpg)|出力 (2) (answers/answer_30_2.jpg)|
+|入力 (imori.jpg)|出力 (1) (answers_image/answer_30_1.jpg)|出力 (2) (answers_image/answer_30_2.jpg)|
 |:---:|:---:|:---:|
-|![](imori.jpg)|![](answers/answer_30_1.jpg)|![](answers/answer_30_2.jpg)|
+|![](imori.jpg)|![](answers_image/answer_30_1.jpg)|![](answers_image/answer_30_2.jpg)|
 
 答え >> 
 
 答え 
-- Python >> [answers/answer_30.py](answers/answer_30.py) , 
+- Python >> [answers_py/answer_30.py](answers_py/answer_30.py) , 
 - C++ >> [answers_cpp/answer_30.cpp](answers_cpp/answer_30.cpp)
diff --git a/Question_21_30/answers/.DS_Store b/Question_21_30/answers/.DS_Store
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