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JAMB 2017 · UTME (set 2) · Q8

If temperature tt is directly proportional to heat hh, and when t=20∘Ct = 20^\circ\text{C}, h=50 Jh = 50\text{ J}, find tt when h=60 Jh = 60\text{ J}.

Worked solution (try it first)
  1. t=kht = kh.
  2. Put in t=20t = 20, h=50h = 50: k=2050=25k = \frac{20}{50} = \frac25.
  3. When h=60h = 60: t=25×60=24∘Ct = \frac25 \times 60 = 24^\circ\text{C}, option A.

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