exam Maths Puzzle Numerical Ability

Please help! How do I solve the following equations?

(a) -x+12=-4+x

(b) 3(x-2)+2=2(x-4)

(c) x/5 - x/3 = 8/15

(d) I = Prt Solve for r

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exam Other Question

Suppose you have six families consisting of a mother, a father, and a child.

How many ways can the families sit in a row of 18 chairs such that members of each family are sitting together? A cliff diver in Acapulco, Mexico, dives from about 17m above the water. The diver's height above the water h, in metres, after t seconds is modelled by
h= -4.9t squared + 1.5t +