Oliver, Valen, Bryan and Charlie paid a total of $231 for a present. Charlie paid ²₅ of what the rest paid. Oliver paid 50% of what the rest paid. Valen and Bryan paid an equal amount of money. How much did Bryan pay?

Oliver	Valen	Bryan	Charlie	Total
5x3			2x3	7x3
1x7	2x7			3x7
	1	1
7 u	4 u	4 u	6 u	21 u

50%= ⁵⁰₁₀₀= ¹₂
Oliver's share : Total share = 1 : 2

The total amount paid for the present is repeated.  Make the total amount the same.  LCM of 7 and 3 is 21.

Amount that Valen, Bryan and Charlie paid = 14 u

Amount that Valen and Bryan paid
= 14 u - 6 u
= 8 u

The amount that Valen and Bryan each paid is the same.

Amount that Valen and Bryan each paid
= 8 u ÷ 2
= 4 u

Cost of the present = 21 u

21 u = 231

1 u = 231 ÷ 21 = 11

Amount that Bryan paid
= 4 u
= 4 x 11
= $44

Answer(s): $44