A bulldozer could carry 1/5 of a ton of sand. If a park needed 4 tons of sand, how many loads would the bulldozer need to carry?

5x5 = 25

25x4 = 100

It needs to carry 100 loads

The answer is 20.

If you think about it as 5/5 is 1 and one load is 1/5, you need 5 loads to get 1 ton. Then, you need another 3. To get this you do 5 X 3. So you need 15 loads to get 3. Then add 15 + 5 which then gives you 20