Question

60% of a number is 90.

What is 50% of that same number?









A.
30







B.
45







C.
75







D.
150

Answer 1

Please edit the question and use proper spacing next time :D

So we know that 60% of some number is 90.
Let's set x to be that number :)
So we have 60%x=90
And then, we see that 60% is equivalent to 0.6.
Then, the equation transforms to 0.6x=90

Solve that equation by dividing both sides by 0.6, and you get x=90/0.6
Simplify that and you get x=150

50% of the same number can be expressed as 50%x.
And remember that 50%=0.5
Therefore, 50%x=0.5x
And substitute x=150 inside:
50%x=0.5x=0.5*150=75

Problem solved :D

Answer 2

thx