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The average of 3 numbers is 7 and averag...

The average of 3 numbers is 7 and average of first two numbers is 4. What is the third number ?

A

15

B

13

C

7

D

4

Text Solution

Verified by Experts

The correct Answer is:
B
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ARIHANT PUBLICATION PUNJAB-PROBLEMS BASED ON ARITHMETIC - CHAPTER EXERCISE
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  3. Geeta arrives at school from home in 42 min by travelling at a uniform...

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  4. A person buys a book for Rs 85 and sells it for Rs 98.60 . Find his pr...

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  5. Ram loses the cost of 6 pens of selling of 144 pens. What is the perce...

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  6. A man travels some distance at a speed of 12km/hr and returns at a spe...

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  7. A car travels at a speed of 60 km/hr and covers a particular distance ...

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  8. A train 800 metres long is running at the speed of 78 km/hr. If it cro...

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  9. As train is moving at a speed of 132 km/hr. if the length of the tr...

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  10. An elevator descends into a mine shaft at the rate of 6 m/min. If the ...

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  11. What is the interest on Rs. 500 for six months with a rate of interest...

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  12. In how many year interest of Rs. 3000 will be Rs. 1080 at the simple i...

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  13. At what rate the simple interest will be 2/5 times to te original sum ...

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  14. If some amount in rupees at the annual rate of simple interest 5% for ...

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  15. A student was asked to find the arithmetic mean of the following 12 nu...

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  16. The sumof(16%of24.2) and (10% of 2. 42) is

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  17. A truck travels at 90 km/hr for the first 1(1)/(2) hours. After that i...

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  18. The average of 7 consecutive numbers is 20. The largest of these numbe...

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  19. The marks obtained in 4 subjects in an examination are 200. If the ave...

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  20. A person sold a cycle Rs 935 with a gain of 10%. Then, at how much amo...

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