Elementary math

Question

If 3/4 of a sum of money is $80.25, then how much would 2/5 of the same sum of money be?

Answer 1

1) 3/4 S = $80.25

2) Divide both sides by 3/4

Note: Here's the Rule for Division

Change the “÷” (division sign) to “x” (multiplication sign) and invert the number to the right of the sign.

Multiply the numerators.

Multiply the denominators.

3)4/3 * 3/4 S = $80.25/1 * 4/3

4) 12/12 S = $321/3

5) 1 S = 107

6) S = $107.00

To find 2/5 of S

7) 2/5 * $107.00 = $42.80

Answer 2

(3/4)S = 80.25

(2/5)(4/3)(3/4)S = (2/5)(4/3)80.25 = 42.80

Answer 3

(3/4) S = 80.25

(2/5)(4/3)(3/4) S = (2/5)(4/3)*80.25 = 42.80