90% of Fanny's amount was $1188 more than Seth's amount. When Fanny spent 55% of her amount and Seth spent 35% of his amount, they had the same amount of amount left. Find the amount that Seth had at first.

	90% of Fanny's amount	Fanny's amount	Seth's amount
Before	234 u	260 u	180 u
Change		- 143 u (- 55%)	- 63 u (- 35%)
After		117 u	117 u

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

Percentage of Seth's amount left
= 100% - 35%
= 65%

45% = ⁴⁵₁₀₀ = ⁹₂₀
65% = ⁶⁵₁₀₀ = ¹³₂₀

The amounts of amount that Fanny and Seth had left were the same.
Make the numerators the same.

⁹₂₀ of Fanny's amount = ¹³₂₀ of Seth's amount
¹¹⁷₂₆₀ of Fanny's amount = ¹¹⁷₁₈₀ of Seth's amount

Amount that Fanny had = 260 u

90% of the amount that Fanny had
= 260 u x 90%
= 260 u x ⁹⁰₁₀₀
= 234 u

Difference between 90% of Fanny's amount and Seth's amount
= 234 u - 180 u 
= 54 u

54 u = 1188
1 u = 1188 ÷ 54 = 22

Amount that Seth had at first
= 180 u
= 180 x 22
= $3960

Answer(s): $3960