book Maths Puzzle Numerical Ability

Consecutive integers.
I need to find three consecutive integers such that the sum of their squares is 77.

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book Other Question

In how many arrangements can a teacher seat 3 girls and 3 boys in a row of 6 seats if the boys are to have the first, third, and fifth seats?
(A) 6
(B) 9
(C) 12
(D) 36
(E) 720 Solve each of the following systems by substitution.

8x - 4y = 16
Y = 2x - 4