70% of Gillian's amount was $24 more than Oscar's amount. When Gillian spent 55% of her amount and Oscar spent 35% of his amount, they had the same amount of amount left. Find the amount that Oscar had at first.

	70% of Gillian's amount	Gillian's amount	Oscar's amount
Before	182 u	260 u	180 u
Change		- 143 u (- 55%)	- 63 u (- 35%)
After		117 u	117 u

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

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

45% = ⁴⁵₁₀₀ = ⁹₂₀
65% = ⁶⁵₁₀₀ = ¹³₂₀

The amounts of amount that Gillian and Oscar had left were the same.
Make the numerators the same.

⁹₂₀ of Gillian's amount = ¹³₂₀ of Oscar's amount
¹¹⁷₂₆₀ of Gillian's amount = ¹¹⁷₁₈₀ of Oscar's amount

Amount that Gillian had = 260 u

70% of the amount that Gillian had
= 260 u x 70%
= 260 u x ⁷⁰₁₀₀
= 182 u

Difference between 70% of Gillian's amount and Oscar's amount
= 182 u - 180 u 
= 2 u

2 u = 24
1 u = 24 ÷ 2 = 12

Amount that Oscar had at first
= 180 u
= 180 x 12
= $2160

Answer(s): $2160