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Ratio and Proportion
If 40% of a number is equal to two-third of another number, what is the ratio of first number to the second number?
2 : 5
3 : 7
5 : 3
7 : 3
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Correct Answer:
5 : 3
Explanation:
Let 40% of A =
2
B
3
Then,
40A
=
2B
100
3
⟹
2A
=
2B
5
3
⟹
A
=
❨
2
x
5
❩
=
5
B
3
2
3
∴ A : B = 5 : 3.
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