exam Maths Puzzle Numerical Ability

Solve for c
1/a + 1/b = 1/c solve for c

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exam Other Question

When x number of units are sold, the price of each unit (in
dollars) is given by p = -x/2 + 75. Find the unit price when the following quantities
are sold: 2, 7, 9, 11. 11m-4m-m=48