In a school, 0.8 of the boys and 0.3 of the girls take part in quizzes. There is an equal number of girls and boys who do not take part in quizzes. If 465 children take part in quizzes, how many less children do not take part in quizzes than those who take part in quizzes?
Boys |
Girls |
Take part |
Do not take part |
Take part |
Do not take part |
4x7 |
1x7 |
3 |
7 |
|
1x7 |
|
1x7 |
28 u |
7 u |
3 u |
7 u |
0.8 =
45 Boys that take part : Boys that do not take part = 4 : 1
0.3 =
310 Girls that take part : Girls that do not take part = 3 : 7
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 7 is 7.
Number of children who take part in quizzes
= 28 u + 3 u
= 31 u
31 u = 465
1 u = 465 ÷ 31 = 15
Number of children who do not take part in quizzes
= 7 u + 7 u
= 14 u
Number of less children who do not take part in quizzes than those who take part in quizzes
= 31 u - 14 u
= 17 u
= 17 x 15
= 255
Answer(s): 255