Not sure if my approach is easier or harder but I used the LCM method. I find it helps simplify a lot of questions.
1:4 = 5
2:5 = 7
5 & 7 LCM = 35. Since A is twice as much as B. then A must be 70 and B = 35. (even if its 140 & 70, the ratio will be same).
A= 14 boys, 56 girls.
B= 10 boys, 25 girls.
24 boys : 81 girls divide by 3... = 8:27.
1:4 = 5
2:5 = 7
5 & 7 LCM = 35. Since A is twice as much as B. then A must be 70 and B = 35. (even if its 140 & 70, the ratio will be same).
A= 14 boys, 56 girls.
B= 10 boys, 25 girls.
24 boys : 81 girls divide by 3... = 8:27.
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