Luke, Oliver, Justin and Japheth paid a total of $330 for a present. Japheth paid ³₇ of what the rest paid. Luke paid 20% of what the rest paid. Oliver and Justin paid an equal amount of money. How much did Justin pay?

Luke	Oliver	Justin	Japheth	Total
7x3			3x3	10x3
1x5	5x5			6x5
	1	1
5 u	8 u	8 u	9 u	30 u

20%= ²⁰₁₀₀= ¹₅
Luke's share : Total share = 1 : 5

The total amount paid for the present is repeated.  Make the total amount the same.  LCM of 10 and 6 is 30.

Amount that Oliver, Justin and Japheth paid = 25 u

Amount that Oliver and Justin paid
= 25 u - 9 u
= 16 u

The amount that Oliver and Justin each paid is the same.

Amount that Oliver and Justin each paid
= 16 u ÷ 2
= 8 u

Cost of the present = 30 u

30 u = 330

1 u = 330 ÷ 30 = 11

Amount that Justin paid
= 8 u
= 8 x 11
= $88

Answer(s): $88