If a3 = 1 + 7, 33 = 1&nbs

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 Multiple Choice QuestionsMultiple Choice Questions

61.

Cost price of 20 articles is equal to selling price of x articles. If the profit is 25%, then the value of x is

  • 15

  • 16

  • 18

  • 25


62.

The value of a machine depreciates at the rate of 10% per year. It was purchased 3 yr ago. If its present value is 145800 for how much was it purchased?

  • 175800

  • 180000

  • 200000

  • 210000


63.

If x2 + 1x2 = 34, then find the value of x + 1x

  • 4

  • 6

  • 8

  • 17


64.

What value should come in place of question mark ?

(1.06 + 0.04)2 - ? = 4 x 1.06 x 0.04

  • 1.0404

  • 1.4

  • 1.5

  • 1.45


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65.

Sum of first 20 terms of the Arithmetic Progression (AP) 11, 7, 3, ... is

  • 20

  • - 540

  • 980

  • - 65


66.

If x : y = 3 : 4, then find the value of 2x + 3y3x + 4y

  • 925

  • 1825

  • 718

  • 1725


67.

0.46 x 0.46 + 0.54 x 0.54 + 0.92 x 0.54 = ?

  • 1

  • 10

  • 11

  • 0.12


68.

If the price of an item A is 25% less than that of the item B. How much per cent is the price of B more than that of A ?

  • 50

  • 3313

  • 1623

  • 25


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69.

Bhaskara's book 'Leelavati' was translated
into English by

  • James taylor

  • Mark taylor

  • A.I. Babham

  • None of these


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70.

If a3 = 1 + 7, 33 = 1 + 7 + b and 43 = 1 + 7 + c,  where a, b and c are different positive integers, then the value of a + b + c is

  • 77

  • 79

  • 58

  • 68


A.

77

Given, Equationsa3 = 1 + 7         ... i33 = 1 + 7 + b ...ii43 = 1 + 7 +c ... iiiFrom Eq i, we geta3 = 1 + 7a3 = 8  a = 2From Eq ii3 × 3 × 3 = 8 + b27 - 8 = bb = 19From Eq iii, we get4 × 4 × 4 = 8 + cc = 64 - 8c = 56 Value of a + b + c = 2 +56 + 19= 77


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