PSLE In a school, 30% of the members in Chess Club and 40% of the members in Literary Club are boys. Both clubs have the same number of girls. The Chess Club has 20 less boys than the Literary Club. How many members are there in Literary Club?
|
Chess Club |
Literary Club |
Types |
Boys |
Girls |
Boys |
Girls |
Comparing the boys and the girls in each club |
3x3 |
7x3 |
2x7 |
3x7 |
Comparing the girls in 2 clubs |
|
1 |
|
1 |
|
9 u |
21 u |
14 u |
21 u |
30% =
30100 =
310 Fraction of the members in Chess Club that are girls
= 1 -
310 =
710 40% =
40100 =
25 Fraction of the members in Literary club that are girls
= 1 -
25 =
35 The number of girls in both clubs is the same. Make the numerators the same. LCM of 7 and 3 is 21.
7x310x3 of the members in Chess Club =
3x75x7 of the members in Literary Club
2130of the members in Chess Club =
2135 of the members in Literary Club
Number of less boys in Chess Club than Literary Club
= 14 u - 9 u
= 5 u
5 u = 20
1 u = 20 ÷ 5 = 4
Number of members in Literary Club
= 35 u
= 35 x 4
= 140
Answer(s): 140