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The average of twenty-five numbers is 18...

The average of twenty-five numbers is 18, the average of first twelve is 14 and that of last twelve is 17. The thirteenth number is

A

78

B

76

C

77

D

79

Text Solution

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The correct Answer is:
A
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ARIHANT PUBLICATION PUNJAB-PROBLEMS BASED ON ARITHMETIC -CHAPTER EXERCISE
  1. The average of twenty-five numbers is 18, the average of first twelve ...

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  2. If A, B, C and D are four numbers such that A:B=2:3,B:C=4:5,C:D=5:8, t...

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  3. Two sums of money are proportional to 8:13. If the first sum ₹ 48, the...

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  4. The correct ascending order of magnitude, if the ratios 1:2, 2:5 and 3...

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  5. If a/b=b/c=c/d ,\ t h e n(b^3+c^3+d^3)/(a^3+b^3+c^3) will be equ...

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  6. If (x^(3)+3x)/(3x^(2)+1)=(341)/(91), then the value of x is

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  7. I have one rupee coins, fifty paise coins and twenty five paise coins....

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  8. Anita bought some pencils, erasers and graph papers from a stationry s...

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  9. Suppose y varies as the sum of two quantities of which one vasries dir...

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  10. Average of four numbers is 10.5. If three of these numbers be 4, 9 and...

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  11. Average age of a group of five students is 14 yr. If a new student als...

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  12. A bike coveres a distance of 240 km in 5 h. Again, it coveres an anoth...

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  13. The average of five numbers is 496. If two of them are 117 and 140, fi...

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  14. Income of x is greater than income of y by 25%. Income of y is how man...

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  15. The difference between 78% of a number and 59% of the same number is 3...

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  16. Find the value of x% of y+y% of x.

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  17. 8% of A is equal to 4% of B, then 20% of A is

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  18. If 50% of (x-y)=30% of (x+y) then what percent of x is y

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  19. When 35 is subtracted from a number , it reduces to its 80% . What is ...

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  20. A number is first increased by 10% and then reduced by 10%. The number

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  21. There are 1240 employees in an organisation. Out of which, 25% are pro...

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