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Interview Mental Math - 10

### Interview Mental Math - 10 1. If I lose 25 percent, by selling a book for Rs.3 What is my cost price? a. Rs.5 b. Rs.6 c. Rs.4.75 d. Rs.4 2. Ali is both the 15th best and the 15th worst student at his school. How many students attend her school? a. 51 b. 30 c. 41 d. 31 3. Six men can paint 20 houses in 30 days. Three men will paint 10 houses in? a. 20 days b. 90 days c. 15 days d. 30 days 4. Ali is 4 years older than Asif, sum of their ages is 20 years, find their ages? a. Ali 13 years, Asif 9 years b. Ali 12 years, Asif 8 years c. Ali 11 years, Asif 1 years d. Ali 10 years, Asif 6 years 5. Click the correct answer. Do not use a calculator: 1/4 + * = 3/4? a. 2/5 b. 1/4 c. 1/3 d. ½ 6. Two numbers have a sum of 20. If one number is 2 more than the other, what is the larger number? a. 11 b. 8 c. 12 d. 9 7. What is 60% of 60? a. 24 b. 36 c. 34 d. 28 8. If 25% decrease is applied to 4, it will become? a. Exactly 3.5 b. More than 3 c. Exactly 3 d. Less then 3 9. A boy is 6 years old and his elder brother is twice as old. When the boy is 9 years old, what will be the age of his sister?  a. 14 years b. 12 years c. 16 years d. 15 years
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