PSLE In a school, 50% of the members in Fitness Club and 70% of the members in Reading Club are girls. Both clubs have the same number of boys. The Reading Club has 32 more girls than the Fitness Club. How many girls are there altogether?
|
Fitness Club |
Reading Club |
Types |
Girls |
Boys |
Girls |
Boys |
Comparing the girls and the boys in each club |
1x3 |
1x3 |
7x1 |
3x1 |
Comparing the boys in 2 clubs |
|
1 |
|
1 |
|
3 u |
3 u |
7 u |
3 u |
50% =
50100 =
12 Fraction of the members in Fitness Club that are boys
= 1 -
12 =
12 70% =
70100 =
710 Fraction of the members in Reading club that are boys
= 1 -
710 =
310 The number of boys in both clubs is the same. Make the numerators the same. LCM of 1 and 3 is 3.
1x32x3 of the members in Fitness Club =
3x110x1 of the members in Reading Club
36of the members in Fitness Club =
310 of the members in Reading Club
Number of more girls in Reading Club than Fitness Club
= 7 u - 3 u
= 4 u
4 u = 32
1 u = 32 ÷ 4 = 8
Total number of girls
= 3 u + 7 u
= 10 u
= 10 x 8
= 80
Answer(s): 80