Question

Kushagra performed the following operations. Find the step in which he has gone wrong:
i. 4y + 3y - 2y = 10
ii. 2y + 3y = 10
iii. 5y = 10
iv. y = $5\times 10$ = 50

• A. ii
• B. iii
• C. iv
• D. All the steps are correct

Answer 1

The correct option is C

iv

Step iv is wrong.
$5\times y=10$
Divide with 5 on both sides.
$\frac{5\times y}{5}$ = $\frac{10}{5}$
So y = $\frac{10}{5}$ = 2
In general, multiplication when transfered to the other side of the equation becomes division.
5y = 10. So, y = $\frac{10}{5}$ = 2