exam Maths Puzzle Numerical Ability

The sum of the reciprocals of two consecutive integers is 11/30. Find these integers.

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exam Other Question

This is the addition method, you have to multiply before you add to get the solution set.

I thought that the first problem was set up as 1(x+y)=(48)1 then I got lost???

x+y=48
12x+14y=628 The monthly profit P (in dollars) that Jim makes on the sale of x mobile homes is determined by the formula P = x2 + 5x - 50. Find the values of x for which Jim makes profit.