Winnie has 25% as many stamps as Gabby. Gabby has 130% as many stamps as Ivory. If Gabby gives 12 stamps to Ivory, both will then have an equal number of stamps. Find the average number of stamps the three of them have.

Winnie	Gabby	Ivory
1x13	4x13
	13x4	10x4
13 u	52 u	40 u

25% = ²⁵₁₀₀ = ¹₄
130% = ¹³⁰₁₀₀= ¹³₁₀

The number of stamps that Winnie has is repeated.  Make the number of stamps that Winnie has the same. LCM of 4 and 13 is 52.

	Gabby	Ivory	Total
Before	52 u	40 u	92 u
Change	- 6 u	+ 6 u
After	46 u	46 u	92 u

Total number of stamps that Gabby and Ivory have
= 52 u + 40 u
= 92 u

After Gabby gives to Ivory, both of them will have the same number of stamps. 

The total number of stamps that Gabby and Ivory have remains unchanged.

Number of stamps that each of them will have
= 92 u ÷ 2
= 46 u

Number of stamps that Gabby gives to Ivory
= 52 u - 46 u
= 6 u

6 u = 12

1 u = 12 ÷ 6 = 2

Total number of stamps that three of them have
= 92 u + 13 u
= 105 u

Average number of stamps that each of them have
= 105 u ÷ 3
= 35 u
= 35 x 2
= 70

Answer(s): 70