Daniel, Zeph, Pierre and Albert paid a total of $450 for a souvenir. Albert paid ⁴₅ of what the rest paid. Daniel paid 25% of what the rest paid. Zeph and Pierre paid an equal amount of money. How much did Pierre pay?

Daniel	Zeph	Pierre	Albert	Total
5x5			4x5	9x5
1x9	4x9			5x9
	1	1
9 u	8 u	8 u	20 u	45 u

25%= ²⁵₁₀₀= ¹₄
Daniel's share : Total share = 1 : 4

The total amount paid for the souvenir is repeated.  Make the total amount the same.  LCM of 9 and 5 is 45.

Amount that Zeph, Pierre and Albert paid = 36 u

Amount that Zeph and Pierre paid
= 36 u - 20 u
= 16 u

The amount that Zeph and Pierre each paid is the same.

Amount that Zeph and Pierre each paid
= 16 u ÷ 2
= 8 u

Cost of the souvenir = 45 u

45 u = 450

1 u = 450 ÷ 45 = 10

Amount that Pierre paid
= 8 u
= 8 x 10
= $80

Answer(s): $80