In a school, 0.8 of the boys and 0.1 of the girls take part in competitions. There is an equal number of girls and boys who do not take part in competitions. If 629 students take part in competitions, how many less students do not take part in competitions than those who take part in competitions?
Boys |
Girls |
Take part |
Do not take part |
Take part |
Do not take part |
4x9 |
1x9 |
1 |
9 |
|
1x9 |
|
1x9 |
36 u |
9 u |
1 u |
9 u |
0.8 =
45 Boys that take part : Boys that do not take part = 4 : 1
0.1 =
110 Girls that take part : Girls that do not take part = 1 : 9
The number of girls who do not take part is repeated. Make the number of girls who do not take part the same. LCM of 1 and 9 is 9.
Number of students who take part in competitions
= 36 u + 1 u
= 37 u
37 u = 629
1 u = 629 ÷ 37 = 17
Number of students who do not take part in competitions
= 9 u + 9 u
= 18 u
Number of less students who do not take part in competitions than those who take part in competitions
= 37 u - 18 u
= 19 u
= 19 x 17
= 323
Answer(s): 323