book Maths Puzzle Numerical Ability

How can I solve the following 2 questions:

1.Find the 2 consecutive integers equal to 77.

2. 5-2t = M

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book Other Question

This is a tough one.

3y^2+4xy-9x^2=-1

A. Solve for X in terms of Y B. Solve for Y in terms of X
bob has $3 more than Carol, and Carol has twice as much as Leon. Together they have $108. How much does each person have?