John decides to take up illustration. He draws and colors 10 pictures. It takes him 2 hours to draw each picture and 30% less time to color each picture. How long does he spend on all the pictures?
Stream of thoughts:
34
The coloring takes 2 *.

3 =.

6 hours less than the drawing.

So it takes 2 -.

6 = 1.

4 hours per picture.

So it takes him 2 + 1.

4 = 3.

4 hours per picture.

That means it takes 3.

4 * 10 = 34 hours.

.

Therefore, the answer is 34