SOLUTION: One semester the ratio of boys to girls in a class was 4 : 5
The next semester, one girl left the class and the ratio of boys to girls was then 6 : 7
How many boys were there in
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Question 875106: One semester the ratio of boys to girls in a class was 4 : 5
The next semester, one girl left the class and the ratio of boys to girls was then 6 : 7
How many boys were there in the class?
A.) 15
B.) 14
C.) 13
D.) 12
E.) 11
Answer by reviewermath(1029) (Show Source): You can put this solution on YOUR website!
Q:
One semester the ratio of boys to girls in a class was 4 : 5
The next semester, one girl left the class and the ratio of boys to girls was then 6 : 7
How many boys were there in the class?
A:
The number of boys is 4k and the number of girls is 5k.
So , cross-multiply
30k - 6 = 28k
30k - 28k = 6
2k = 6, divide both sides by 2
k = 3
Therefore, 4k = 4(3) = 12 boys
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