PSLE In a school, 40% of the members in Reading Club and 75% of the members in Computer Club are girls. Both clubs have the same number of boys. The Reading Club has 42 less girls than the Computer Club. How many members are there in Computer Club?
|
Reading Club |
Computer Club |
Types |
Girls |
Boys |
Girls |
Boys |
Comparing the girls and the boys in each club |
2x1 |
3x1 |
3x3 |
1x3 |
Comparing the boys in 2 clubs |
|
1 |
|
1 |
|
2 u |
3 u |
9 u |
3 u |
40% =
40100 =
25 Fraction of the members in Reading Club that are boys
= 1 -
25 =
35 75% =
75100 =
34 Fraction of the members in Computer club that are boys
= 1 -
34 =
14 The number of boys in both clubs is the same. Make the numerators the same. LCM of 3 and 1 is 3.
3x15x1 of the members in Reading Club =
1x34x3 of the members in Computer Club
35of the members in Reading Club =
312 of the members in Computer Club
Number of less girls in Reading Club than Computer Club
= 9 u - 2 u
= 7 u
7 u = 42
1 u = 42 ÷ 7 = 6
Number of members in Computer Club
= 12 u
= 12 x 6
= 72
Answer(s): 72