exam Maths Puzzle Numerical Ability

help would be appreciated with this question, thanks.

4a-3ab-4ab+3b-6a

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exam Other Question

The minimum value of z=4x + 10y subject to:
3x+y> or equal to 24
6x+4y> or equal to 66
x> or equal to 0, y> or equal to 0 is: Torry took 6 tests, she had an average 97. First 5 tests had the same score. The last test had 12 points less. What was her last test score?