Latest self Aptitude Question SOLUTION: Consider the sum of first 60 natural numbers.if every digit '6' is replaced by '8' what would be the increase and the new sum?

• Placement Papers
• /
• self

self Question Papers:

(#M40030653) SELF question Number systems Keep an EYE

Consider the sum of first 60 natural numbers.if every digit '6' is replaced by '8' what would be the increase and the new sum?

K Gowtham (10 years ago)

Unsolved Read Solution (3)

Is this Puzzle helpful?   (0)   (0) Submit Your Solution

Read Solution (3) :

RAKESH  (10 years ago)

thanks MAHESH for correcting my mistake
soln will be
sum of first 60 natural number=60(60+1)/2=30*61=1830
every digit '6' is replaced by '8'
i.e 6,16,26,36,46,56,60 are replaced by 8,18,28,38,48,58,80
first six numbers are increased by 2 & 7th by 20
increase in sum=2*6+20=32
new sum=1830+32=1862

Is this solution Helpfull? Yes (3) | No   

RAKESH  (10 years ago)

sum of first 60 natural number=60(60+1)/2=30*61=1830
every digit '6' is replaced by '8'
i.e 6,16,26,36,46,56 are replaced by 8,18,28,38,48,58
each increased by 2
increase in sum=2*6=12
new sum=1830+12=1842

Is this solution Helpfull? Yes (1) | No (2)  

Mahesh  (10 years ago)

There is one number that Rakesh left out, that is 60, is replaced by 80, so the answer that Rakesh pointed out is 20 less

The answer will be 1830 + 2*6 + 20 = 1862
Answer is 1862

Is this solution Helpfull? Yes | No   

Please Login to Read Solution.