Raeann has 25% as many buttons as Linda. Linda has 130% as many buttons as Yen. If Linda gives 42 buttons to Yen, both will then have an equal number of buttons. Find the average number of buttons the three of them have.

Raeann	Linda	Yen
1x13	4x13
	13x4	10x4
13 u	52 u	40 u

25% = ²⁵₁₀₀ = ¹₄
130% = ¹³⁰₁₀₀= ¹³₁₀

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

	Linda	Yen	Total
Before	52 u	40 u	92 u
Change	- 6 u	+ 6 u
After	46 u	46 u	92 u

Total number of buttons that Linda and Yen have
= 52 u + 40 u
= 92 u

After Linda gives to Yen, both of them will have the same number of buttons. 

The total number of buttons that Linda and Yen have remains unchanged.

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

Number of buttons that Linda gives to Yen
= 52 u - 46 u
= 6 u

6 u = 42

1 u = 42 ÷ 6 = 7

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

Average number of buttons that each of them have
= 105 u ÷ 3
= 35 u
= 35 x 7
= 245

Answer(s): 245