Find the sum of all positive multiples of 3 less than 50 from Q

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 Multiple Choice QuestionsMultiple Choice Questions

21.

If the product of two positive numbers is 1575 and their ratio is 7 : 9, then the greater number is 

  • 45

  • 35

  • 135

  • 135

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22.

Find the sum of all positive multiples of 3 less than 50

  • 400

  • 404

  • 408

  • 408


C.

408

Sum of all mutiples of 3 upto 50
 = 3 + 6 + ........+ 48
 = 3 (1 + 2 + 3 + 4 + .......16)
  equals space fraction numerator 3 space cross times space 16 left parenthesis 16 space plus space 1 right parenthesis over denominator 2 end fraction space equals space 3 space cross times space 8 space cross times space 17 space equals space 408
    open square brackets because space 1 space plus space 2 space plus space 3 space plus..... straight n space equals space fraction numerator straight n left parenthesis straight n plus 1 right parenthesis over denominator 2 end fraction close square brackets

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23.

What is the smallest number by which 625 must be divided so that the quotient is a perfect cube?

  • 25

  • 5

  • 2

  • 2

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24.

The unit digit in 3 x 38 x 537 x 1256 is

  • 4

  • 2

  • 6

  • 6

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25.

When 335 is added to 5A7, the result is 8B2. 8B2 is divisible by 3. What is the largest possible value of A?

  • 8

  • 2

  • 1

  • 1

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26.

Which one of the numbers is divisible by 25?

  • 303310

  • 373355

  • 303375

  • 303375

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27.

The greatest 4-digit number exactly number by 10, 15, 20 is

  • 9990

  • 9960

  • 9980

  • 9980

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28.

The odd term in the sequence
0, 7, 26, 63, 124, 217 is

  • 217

  • 7

  • 26

  • 26

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29.

The sum of the squares of two natural consecutive odd numbers is 394. The sum of the numbers is

  • 24

  • 32

  • 40

  • 40

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30.

When (6767 + 67) is divided by 68, the remainder is

  • 1

  • 63

  • 66

  • 66

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