book Maths Puzzle Numerical Ability

What is the value of x and y if 13x + 39y = 1664?

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book Other Question

How do you isolate B2 in the following formula?

A=1/2h(b1+b2) Compute the value of the discriminant and give the number of real solutions to the quadratic equation.

-5x^2 -2x+3=0

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