Explanation:
- 2 soaps are needed to clean 1 apple
1 apple = 2 soaps
- For 20 apples you will need
20 apples = 2 ×20 soaps
= 40 soaps
Here, you had 40 liquid soaps and for cleaning 20 apples you need 40 soaps,
Therefore, all apples can be cleaned by using 40 soaps.