At the games fest, there were 48 less boys than girls. After
25 of the boys and
67 of the girls had left the hall, there was an equal number of boys and girls that remained behind. Find the number of boys who were present at the games fest at first.
|
Boys |
Girls |
Less |
Before |
5x1 = 5 u |
7x3 = 21 u |
16 u |
Change |
- 2x1 = - 2 u |
- 6x3 = - 18 u |
|
After |
3x1 = 3 u |
1x3 = 3 u |
|
Fraction of boys that remained
= 1 -
25 =
35 Fraction of girls that remained
= 1 -
67 =
17 The number of boys and girls in the end is the same. Make the number of boys and girls in the end the same. LCM of 3 and 1 is 3.
3x15x1 Boys =
1x37x3 Girls
35 Boys =
321 Girls
Total boys at first = 5 u
Total girls at first = 21 u
Number of less boys than girls at first
= 21 u - 5 u
= 16 u
16 u = 48
1 u = 48 ÷ 16 = 3
Number of boys at first
= 5 u
= 5 x 3
= 15
Answer(s): 15