Question

A boy added alll natural numbers from 1 to 20.however he addes one number twice due to which the sum becomes 215.what is the number which he added twice?

Answer 1

5is the best and correct answer

Answer 2

Hey user, here is your answer...
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•A boy added all natural numbers from 1 to 20.

•He adds one number twice due to which the sum becomes 215.

•By adding all the natural numbers from 1 to 20 we get:-

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 +16 + 17 + 18 + 19 + 20

= 210

•By subtracting 210 from 215 we get,

215 - 210

= 5

•We get the number 5 which means the natural number 5 must have been added twice due to which the sum is 215.

•Therefore, the number which the boy added twice is the number '5'
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Hope it helps.
Thanks for the question.