Question

A man receives Rs. 60 for the first week and Rs. 3 more each week than the preceeding week.
How much does he earns by the 20th week ?
(a) Rs. 1760
(b) Rs. 0770 (c) Rs. 1780 (d) Rs. 1790

Answer 1

Answer:

Rs. 117.

Because:

3×19 (as the first week is already over)

=57.

Add 57 and 60.

57+60= 117

So, the answer is none of these even if there is no option as none of these.

(Or if I'm wrong the answer will be (b) 1170.)

Answer 2

Answer:

b)1770

Explanation:

This is a question of A.P

here, a=60

d=3

n=20

and here we have to find sum(S)

soln:-

---------

S=n/2{2a+(n-1)d}

=20/2 {2(60)+19(3)}

=10(120+57)

=10(177)

=1770

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