Question

the number of boys and girls in a class are in the ration 5:4 . The number of boys is 4 more than the number of girls . what is the total class strength.

a) 20,15

b) 20,16

c) 16,12

d) 16,8



answer with full explanation



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Answer 1

Answer:

b) 20,16

Step-by-step explanation:

let the no. of girls is x

so no. of boys is x+4

so,

ATQ

x/x+4=4/5

5x=4x+16

5x-4x=16

x=16

no. of girls is 16

so boys is 16+4=20

hence, Total strength is 16+20=36

please follow me please

Answer 2

Answer:

Let the no. of boys and girls be 5x and 4x respectively.

No. of boys = No. of girls + 4

=> 5x = 4x + 4

=> 5x-4x = 4

=> x = 4.

THEREFORE,

No. of boys = 5x = 5×4 = 20.

No. of girls = 4x = 4×4 = 16.

Total strength is = 20+16 = 36.

And your Ans is = (b) 20, 16.