PSLE In a school, 30% of the members in Reading Club and 80% of the members in Computer Club are boys. Both clubs have the same number of girls. The Reading Club has 75 less boys than the Computer Club. How many members are there in Computer Club?
|
Reading Club |
Computer Club |
Types |
Boys |
Girls |
Boys |
Girls |
Comparing the boys and the girls in each club |
3x1 |
7x1 |
4x7 |
1x7 |
Comparing the girls in 2 clubs |
|
1 |
|
1 |
|
3 u |
7 u |
28 u |
7 u |
30% =
30100 =
310 Fraction of the members in Reading Club that are girls
= 1 -
310 =
710 80% =
80100 =
45 Fraction of the members in Computer club that are girls
= 1 -
45 =
15 The number of girls in both clubs is the same. Make the numerators the same. LCM of 7 and 1 is 7.
7x110x1 of the members in Reading Club =
1x75x7 of the members in Computer Club
710of the members in Reading Club =
735 of the members in Computer Club
Number of less boys in Reading Club than Computer Club
= 28 u - 3 u
= 25 u
25 u = 75
1 u = 75 ÷ 25 = 3
Number of members in Computer Club
= 35 u
= 35 x 3
= 105
Answer(s): 105