Jen and Esther collected stamps. Jen gave 25% of her stamps to Esther and as a result, Esther's stamps increased by 30%. If Jen had 63 stamps left, find the number of stamps Esther should give to Jen in the end so that both had an equal number of stamps.

	Jen	Esther	Comparing the change in Esther's stamps
Before	4x3 = 12 u		10x1 = 10u
Change	- 1x3 = - 3 u	+ 1x3 = + 3 u	+ 3x1 = + 3 u
After	3x3 = 9 u		13x1 = 13 u

25% = ²⁵₁₀₀ = ¹₄
30% = ³⁰₁₀₀ = ³₁₀

The increase in the number of stamps that Esther had is repeated.  Make the increase in the number of stamps that Esther had the same. LCM of 1 and 3 = 3

9 u = 63

1 u = 63 ÷ 9 = 7

Number of stamps that Esther had more than Jen in the end
= 13 u - 9 u
= 4 u

Number of stamps that Esther should give to Jen so that both had an equal number of stamps in the end
= 4 u ÷ 2
= 2 u
= 2 x 7
= 14

Answer(s): 14