exam Maths Puzzle Numerical Ability

A certain sum of money is invested at 10%. Twice that amount is invested at 8%. The total amount of interest from both investments is $91.00. How much is invested at 8%. Can you show me how you work it out and solve it?

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suppose that the length of a rectangle is 3 inches longer thant the width and that the perimeter of a rectangle is 78

set up an equation involving only L, the length of the rect 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