exam Maths Puzzle Numerical Ability

LINEAR PROGRAMMING

The maximum value of z = 20x + 8y subject to

3x + y <= 8
2x + 5y <= 18
x => 0, y <=0 is

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exam Other Question

A sly old fox ate 100 grapes in 5 days, each day eating 6 more than on the day before. How many did he eat on each of the 5 days? Can someone help me on this problem?

Which of the ordered pairs:
(-3,3), (9,0), (-3, -3), (-23, 8)
are solutions for the equation x + 4y = 9?

Thanks,
Sher