exam Maths Puzzle Numerical Ability

x(2x-1)-10=-2x(1-x)

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exam Other Question

If you get a 68 on one test, a 73 on a second test and an 84 on the third test, what score must you get on a fourth test in order to have an average of 80? In electronics, circuit gain is modeled by
G = Bt/R + r (lower case) t
where R is the value of a resistor, tis temperature, R (lower case)t is the value of R at temperature t, a