exam Maths Puzzle Numerical Ability

3+u=-21

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exam Other Question

(Modeling) Circuit Gain
In electronics, circuit gain is modeled by
G = Bt/R + Rt
where R is the value of a resistor, t is temperature, Rt is the value of R at temperature t, and andy is 6 years older than tom. the sum of thier ages is 26. how old are they?