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प्रश्न
Sum of a number and its half is 30 then the number is ______
पर्याय
15
20
25
40
उत्तर
20
Explanation;
Hint:
Let number be ‘x’
∴ half of number is `x/2`
Sum of number and it’s half is given by
`x + x/2` = 30 ...[Multiplying by 2 on both sides]
2x + x = 30 × 2
3x = 60
x = `60/3`
= 20
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