40% of Sabrina's amount was $1131 less than Japheth's amount. When Sabrina spent 45% of her amount and Japheth spent 60% of his amount, they had the same amount of amount left. Find the amount that Japheth had at first.

	Sabrina	Japheth
Before	40 u	55 u
Change	- 18 u	- 33 u
After	22 u	22 u

Percentage of Sabrina's amount left
= 100% - 45%
= 55%

Percentage of Japheth's amount left
= 100% - 60%
= 40%

55% = ⁵⁵₁₀₀ = ¹¹₂₀
40% = ⁴⁰₁₀₀ = ²₅

The amounts of amount that Sabrina and Japheth had left were the same. Make the numerators the same.

¹¹₂₀ of Sabrina's amount = ²₅ of Japheth's amount
²²₄₀ of Sabrina's amount = ²²₅₅ of Japheth's amount

Amount that Sabrina had = 40 u

40% of the amount that Sabrina had
= 40% x 40 u
= ⁴⁰₁₀₀ x 40 u
= 16 u

Difference between Japheth's amount and 40% of Sabrina's amount
= 55 u - 16 u
= 39 u

39 u = 1131

1 u = 1131 ÷ 39 = 29

Amount that Japheth had at first
= 55 u
= 55 x 29
= $1595

Answer(s): $1595