There were 238 children enrolled in the Betty Computer School in 2019.
37 of the children were girls. Additional children joined the computer school in 2020. For every 3 girls who joined the computer school, 2 boys joined the computer school. If there was an equal number of boys and girls in 2020, how many boys joined the school in that year?
|
Girls |
Boys |
Before |
102 |
136 |
Change |
+ 3 u |
+ 2 u |
After |
102 + 3 u |
136 + 2 u |
Fraction of children who are boys
= 1 -
37 =
47 Number of girls at first
=
37 x 238
= 102
Number of boys at first
=
47 x 238
= 136
Girls who joined : Boys who joined
3 : 2
The number of boys and girls in the end is the same.
102 + 3 u = 136 + 2 u
3 u - 2 u = 136 - 102
1 u = 34
Number of boys who joined the school in that year
= 2 u
= 2 x 34
= 68
Answer(s): 68