Selina solutions

Selina solutions

Grade 7

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Question 12

Q12) Find the result of subtracting the sum of all integers between 20 and 30 from the sum of all integers from 20 to 30.

Solution 12:

Sum of the all integers from 20 and 30

20+21+22+23+24+25+26+27+28+29+30=275

Sum of the all integers between 20 and 30

21+22+23+24+25+26+27+28+29=225

∴ Required number= (Sum of the all integers from 20 and 30)-(Sum of the all integers between 20 and 30 )

=275-225

=50

∴The required number is 50.

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