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Interview Mental Math - 16

### Interview Mental Math - 16 1. In a class of 30 students, the average age is 10 years, if the teacher age is also included, the average age increases by one year. The teacher’s age is? a. 54 years b. 32 years c. 51 years d. 41 years 2. Combined age of two brothers is 20 years. I there is a difference of 2 years between their ages, find out the age of younger brother? a. 8 Years b. 11 Years c. 7 Years d. 9 Years 3. What is the profit in percent, if a book costing Rs.100 is sold for Rs.110? a. 11.5% b. 10% c. 9% d. 11% 4. Ali invested Rs.1000 for 1 year. At what rate he will get Rs.200 as a profit? a. 20% b. 22% c. 16% d. 11% 5. The average of three numbers is 6. If the average of first two numbers is 7 then find the third number? a. 4 b. 3 c. 3.5 d. 4.5 6. A bicycle costing Rs.570 is sold at Rs.600. What is the profit percentage? a. 4.75% b. 11.1% c. 5.25% d. 5% 7. Click the correct answeDo not use a calculator: 35 + 18 = 29 + ? a. 21 b. 22 c. 32 d. 24 8. What is 50% of 50?  a. 20 b. 25 c. 35 d. 30

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