Question

solve this .
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Answer 1

Answer:

Answer no. 4

$the \: ratio \: of \: boys \: and \: girls \: is = 7 \div 4 \: \\ no \: of \: boys \: is = 490 \\ let \: no \: of \: girls \: is \: x \\ according \: to \: question \: \\ no \: of \: boys \div no \: of \: girls \: = ratio \: of \: boys \: and \: girls \: \\ 490 \div x = 7 \div 4 \\ 490 \times 4 = 7 \times x \\ 1960 = 7x \\ 7x = 1960 \\ x = 1960 \div 7 \\ x = 280$

I hope you understand

Answer 2

Answer:

sorry, i not know the 3rd.

(4)no. of boys is=490

let no. of girls is x

according to question

no. of boys÷no. of girls=ratio of boys and girls

490÷x=7÷4

490×4=7×x

1960=7x

7x=1960

x=1960÷7

x=280

(5)Let,number be 5x,9x

subtracting 3 from each we get 5x-3,9x-3

5x-3/9x-3=1/2

2(5x-3)=9x-3

10x-6=9x-3

10x-9x=-3+6

x=3

5x=5(3)=15

9x=9(3)=27

so,the numbers are 15,27

Step-by-step explanation:

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