Jaslyn, Opal, Raeann and Xandra jointly contributed to the cost of a present for their brother. Jaslyn's contribution is ²₅ of the total contribution made by the four girls. The ratio of Xandra's contribution to the total of Opal's and Raeann's contribution is 5 : 2. What is the total contribution by the four girls if Opal's contribution is ²₇ of Raeann's contribution and the total amount contributed by Jaslyn and Xandra is $1479?

Jaslyn	Opal	Raeann	Xandra	Total
2x21	3x21			5x21
	2x9		5x9
	2x2	7x2
42 u	4 u	14 u	45 u	105 u

Working backwards.

Total amount that Opal and Raeann had is the combined repeated identity.
LCM of 2 and 9 = 18

Total amount that Opal, Raeann and Xandra had is the next combined repeated identity.
LCM of 3 and 21 = 63 

Total amount contributed by Jaslyn and Xandra
= 42 u + 45 u
= 87 u

87 u = 1479

2 u = 1479 ÷ 87 = $17

Total contribution by the four girls
= 105 u
= 105 x 17
= $1785

Answer(s): $1785