PSLE
In a school, 30% of the members in Chess Club and 50% of the members in Literary Club are girls. Both clubs have the same number of boys. The Chess Club has 16 less girls than the Literary Club. How many members are there in Literary Club?

	Chess Club		Literary Club
Types	Girls	Boys	Girls	Boys
Comparing the girls and the boys in each club	3x1	7x1	1x7	1x7
Comparing the boys in 2 clubs		1		1
	3 u	7 u	7 u	7 u

30% = ³⁰₁₀₀ = ³₁₀

Fraction of the members in Chess Club that are boys
= 1 - ³₁₀
= ⁷₁₀

50% = ⁵⁰₁₀₀ = ¹₂

Fraction of the members in Literary club that are boys
= 1 - ¹₂
= ¹₂

The number of boys in both clubs is the same. Make the numerators the same. LCM of 7 and 1 is 7. 

7x110x1 of the members in Chess Club = 1x72x7 of the members in Literary Club
710of the members in Chess Club = 714 of the members in Literary Club

Number of less girls in Chess Club than Literary Club
= 7 u - 3 u
= 4 u

4 u = 16

1 u = 16 ÷ 4 = 4

Number of members in Literary Club
= 14 u
= 14 x 4
= 56

Answer(s): 56