Question

If doubling a number and adding $20$ to the result gives the same answer as multiplying the number by $8$ and taking $4$ from the product, the number is:

• A. $2$
• B. $3$
• C. $4$
• D. $6$

Answer 1

The correct option is C $4$

Given,

Doubling a number and adding 20 to the result gives the same answer as

multiplying the number by 8 and taking 4 from the product

let $a$ be the number

from given, we have

$2a+20$.......(1) first condition

$8a-4$.........(2) second condition

since both results same, we have

$2a+20=8a-4$

$20+4=8a-2a$

$24=6a$

$\therefore a=4$