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A principal becomes twice its amount in ...

A principal becomes twice its amount in 20 years at a certain rate of simple interest. At the same rate of simple interest, that principal becomes thrice of its amount in

A

30 years

B

35 years

C

40 years

D

45 years

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UNITED BOOK HOUSE-VIDYASAGAR VIDYAPITH MIDNAPORE-EXERCISE
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  2. A principal becomes twice its amount in 20 years at a certain rate of ...

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  3. If A+B = 90^@ and sin A = 1/3 , then sec B=

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  4. AOB is a diamter of a circle with centreO, C is any point on the circ...

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  5. If the area of a side face of a cube is 256 sq.m. then its volume is

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  6. If the median of arranging the ascending order of data 8,9,12,17,x+2,x...

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  7. Fill in the blanks The compound interest of Rs for 2 years at the ra...

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  8. Fill in the blanks Conjugate surds of (sqrt5-1) is.

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  9. Fill in the blanks If x = 2a sec theta, y = 2b tan theta, then x^2/a...

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  10. Fill in the blanks Two circles touch each other externally. The com...

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  11. Fill in the blanks The curved surface area of a right circular cone ...

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  12. Fill in the blanks If the mode of the data 12,5,x,10,13,5,13,12,x is...

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  13. Write True or False In a business the ratio of the capital of A and B ...

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  14. Write True or False If 2a = 5b= 8c then a:c = 4:1.

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  15. Write True or False If sinA + sinB = 2, (0leAle90^@,0leBle90^@) then c...

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  16. Write True or False The volume of the largest solid cone that can be c...

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  17. Write True or False If mean of the numbers 7,9,x,12,y,17 is 11 then x...

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  18. In 1 year if the ratio of principal and amount is 8:9 , then calculate...

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  19. What should be added to each of 12,22,42,72 to make the sums proportio...

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  20. In a business , A,B,C invest Rs 500 , Rs 450 and Rs 700 respectively. ...

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