Question

7 times 36 = 21 times ?

help needed asap :)

Answer 1

7*36=21*x

252=21x

x=12

Hope it helps!

Answer 2

12

Explanation:

Let x be the unknown number.

Method 1

`\implies \sf 7 * 36 = 21 * x`

`\implies \sf 252 = 21x`

`\implies \sf (252)/(21) = (21x)/(21)`

`\implies \sf 12=x`

`\implies \sf x=12`

Method 2 (using mental arithmetic)

`\implies \sf 7 * 36 = 21 * x`

As 7 and 21 are both multiples of 7, divide both sides by 7:

`\implies \sf 36=3x`

Divide both sides by 3:

`\implies \sf 12=x`

`\implies \sf x=12`