70% of Tammy's amount was $231 more than Bryan's amount. When Tammy spent 60% of her amount and Bryan spent 35% of his amount, they had the same amount of amount left. Find the amount that Bryan had at first.

	70% of Tammy's amount	Tammy's amount	Bryan's amount
Before	45.5 u	65 u	40 u
Change		- 39 u (- 60%)	- 14 u (- 35%)
After		26 u	26 u

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

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

40% = ⁴⁰₁₀₀ = ²₅
65% = ⁶⁵₁₀₀ = ¹³₂₀

The amounts of amount that Tammy and Bryan had left were the same.
Make the numerators the same.

²₅ of Tammy's amount = ¹³₂₀ of Bryan's amount
²⁶₆₅ of Tammy's amount = ²⁶₄₀ of Bryan's amount

Amount that Tammy had = 65 u

70% of the amount that Tammy had
= 65 u x 70%
= 65 u x ⁷⁰₁₀₀
= 45.5 u

Difference between 70% of Tammy's amount and Bryan's amount
= 45.5 u - 40 u 
= 5.5 u

5.5 u = 231
1 u = 231 ÷ 5.5 = 42

Amount that Bryan had at first
= 40 u
= 40 x 42
= $1680

Answer(s): $1680