Question

The number of boy ,girl in a class are in the ratio 7:5 the number of boy is 8 more than the number of girl. What is the total class strength

Answer 1

No.of boys = B
No. of girls = G
>>B:G = 7 : 5
& B is 8 more than G.
>> B/G = 7/5 ----->1
& B = G + 8.------->2
>> 5B = 7G.
>> 5(G + 8) = 7 G
>> 5G + 40 = 7G
>> 40 = 7G - 5G
>> 40= 2G
>> G = 40/2
>> G = 20
From --->2
>> B = G + 8
>> B = 20 + 8
>> B = 28.

Therefore, No. of Boys (B) = 28,
No. of Girls (G) = 20.

Answer 2

The number of boy ,girl in a class are in the ratio 7:5 the number of boy is 8 more than the number of girl. What is the total class strength