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Interview Mental Math - 18

### Interview Mental Math - 18 1. Click the correct answer. Do not use a calculator: 46 + 41 = 44 + ? a. 42 b. 44 c. 43 d. 41 2. Ali invested Rs.1000 for 2 years. He got a profit of Rs. 400 after 2 years. What was the percentage of his profit? a. 15% b. 20% c. 22% d. 11% 3. A Father is 15 time as old as his son. Sum of their ages is 32 years. Find the age of father? a. 35 years b. 28 years c. 32 years d. 30 years 4. What is 20% of 20? a. 4 b. 3 c. 2 d. 2.2 5. The mean of 4 numbers is 16. If the mean of first three is 15, the fourth number is? a. 22 b. 25 c. 28 d. 19 6. Click the correct answer. Do not use a calculator: 150 / 100 = ? a. 1.4 b. 1.8 c. 15 d. 1.5 7. Click the correct answer. Do not use a calculator:.77 - 35 = ? a. 52 b. 42 c. 52 d. 51 8. If 3 men or 6 boys can do a piece of work in 18 days, how many days will 3 men and 6 boys takes to do the same work?  a. 6 b. 4 c. 10 d. 9
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