Explanation
30% of 50 equals 15% of 100, so 15. By adding up the 50 children on Monday and 50-15 children on Tuesday, we get a total of 115 children.
Explanation
A cookbook costs $9.50, so 3 cookbooks cost $28.50.
Explanation
80% of 60 equals 48. The easiest way to do this calculation is to report to 10, 8 versus 10, then multiply by 6 to get to 48 and 60.
Explanation
By purchasing 8 scoops of ice cream in total, Martin pays only the price equivalent to 6 scoops. So, he pays 6 times $1.50, which equals to $9.
Explanation
20 = 20% of x
where x is the unknown number we are trying to find.
We can rewrite 20% as a decimal by dividing it by 100:
20 = 0.2x
To solve for x, we can divide both sides of the equation by 0.2:
x = 20 ÷ 0.2
x = 100
Therefore, 20 is 20% of 100.
