7 times 36 = 21 times ? help needed asap :)

Question

asked Aug 26, 2023 132k views

2 Answers

Ankit Bisht · Answer 1 · 2023-08-31T08:09:23+0000

Answer:

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:

$\implies \sf 12=x$

$\implies \sf x=12$