Question

If x% of 400 is 80, then the value
of 'x' is :-
(a) 40
O (b) 20
O (c) 60
O (d) 80​

Answer 1

Answer:

$x\% \: of \: 400 \: is \: 80 \\ then \: value \: of \: x \: = 200$

Step-by-step explanation:

$x\% \: of \: 400 \: is \: 80 \\ \frac{x}{100} \times 40 = 80 \\ \frac{40x}{100} = 80 \\ 40x = 80 \times 100 \\ 40x = 8000 \\ x = \frac{8000}{40} \\ x = 200$

Answer 2

Answer:

x% of 400 means that (x/100)×400

so if we put 20 in the place of x then

(20/100)×400

answer is 80 .

So, right option is 20.