CTET Class I to V 2015 Feb Paper

Question : 52 of 150

Marks: +1, -0

(Sum of multiples of 7 between 21 and 49) ÷ (Biggest common factor of 25 and 30) is equal to

Solution:

The Biggest common factor of 25 and 30

25=5 × 5

30=6 × 5

Biggest common factor

=5

∴

Multiples of 7 in between 21 and 49 are

=28,35

and 42
Sum of 28, 35 and

42=28+35+42=105

Now, required answer

=\;{105}/{5}=21

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