Ivory, Jean, Hazel and Wendy jointly contributed to the cost of a present for their colleague. Ivory's contribution is ³₅ of the total contribution made by the four girls. The ratio of Wendy's contribution to the total of Jean's and Hazel's contribution is 5 : 1. What is the total contribution by the four girls if Jean's contribution is ²₃ of Hazel's contribution and the total amount contributed by Ivory and Wendy is $630?

Ivory	Jean	Hazel	Wendy	Total
3x15	2x15			5x15
	1x5		5x5
	2x1	3x1
45 u	2 u	3 u	25 u	75 u

Working backwards.

Total amount that Jean and Hazel had is the combined repeated identity.
LCM of 1 and 5 = 5

Total amount that Jean, Hazel and Wendy had is the next combined repeated identity.
LCM of 2 and 15 = 30 

Total amount contributed by Ivory and Wendy
= 45 u + 25 u
= 70 u

70 u = 630

1 u = 630 ÷ 70 = $9

Total contribution by the four girls
= 75 u
= 75 x 9
= $675

Answer(s): $675