passpadi

2017

Mathematics

JAMB

If temperature t is directly proportional to heat h, and when t = 20oC, h = 50 J, find t when h = 60J

A.

24°C

B.

20°C

C.

34°C

D.

30°C

Correct Answer: 24°C

Explanation

t ∝ h, t = 20, h t = ? h = 60 t = kh where k is constant 20 = 50k k = 20/50 k = 2/5 when h = 60, t = ? t = 2/5 × 60 t = 24°C

t ∝ h, t = 20, h t = ? h = 60 t = kh where k is constant 20 = 50k k = 20/50 k = 2/5 when h = 60, t = ? t = 2/5 × 60 t = 24°C
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