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SSC CGL 2021 PYQ — Question 56

SSC CGL - 24 Aug 2021 - Shift 3 • Quantitative Aptitude • Q56

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In the following passage, some words have been deleted. Fill in the blanks with the help of the alternatives given. Select the most appropriate option for each blank.
John was an artist (1)______ profession. He was very (2)______ at his work and could
(3)______ any subject he could think of, but circumstances forced him to (4)______ in
(5)______ the work of renowned artists.

What is the average of number from 1 to 50 which are multiples of 2 or 5 ? ( correct to one decimal place )

Show answer & explanation

Correct answer: B

Explanation

The correct answer is option 2 i.e. 25.8

Average = (1st term + last term)/2 = Sum of elements/No. of elements

Total number of terms (tn)= a + (n - 1)d

n = number of terms, a = 1st term, d = common difference

For 2 -

50 = 2 + 2n - 2

n = 25

Average = (2 + 50)/2 = 26

Total = 26 × 25 = 650

For 5 -

50 = 5 + 5n - 5

n = 10

Average = (5 + 50)/2 = 27.5

Total = 27.5 × 10 = 275

10, 20, 30, 40, and 50 come two times.

Effective total = 650 + 275 - 150 = 775

The number of terms that are multiples of 2 or 5 = 25 + 10 - 5 = 30

Average = 775/30  = 25.8