3/4 of 28 is equal to 21/5 of what number?
- 3
- 5
- 7
- None of these
Explanation
Let's denote the unknown number as x.
Given that 3/4 of 28 is equal to 21/5 of x:
(3/4) * 28 = (21/5) * x
First, calculate 3/4 of 28:
(3/4) * 28 = 21
Now, equate this to 21/5 of x:
21 = (21/5) * x
Multiply both sides by 5:
105 = 21x
Divide both sides by 21:
x = 105 / 21
x = 5
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