A survey was conducted with some pupils.
29 of them chose jogging as their favourite sport.
35 of the remaining pupils chose gymnastics.
12 of those left chose soccer and the last 63 chose aerobic. How many more pupils chose gymnastics than jogging?
Jogging |
Gymnastics |
Soccer |
Aerobic |
2x5 |
7x5 |
|
3x7 |
2x7 |
|
|
1x7 |
1x7 |
|
|
|
63 |
10 u |
21 u |
7 u |
7 u |
The number of pupils who chose gymnastics, soccer and aerobic is repeated. Make the number of pupils who chose gymnastics, soccer and aerobic the same. LCM of 7 and 5 is 35.
Number of pupils who chose soccer = 7 u
7 u = 63
1 u = 63 ÷ 7 = 9
Number of more pupils who chose gymnastics than jogging
= 21 u - 10 u
= 11 u
= 11 x 9
= 99
Answer(s): 99