A candle is 15cm long. If 35% of it burns away in an hour, how much of the candle is left after it has been lighted for 84 minutes?
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= the lenght of candle is 15cm
= lenght of candle burnt in 1 hour is 35%
= that is ( 35 x 15 ) /100 cm
35 x 15 = 525 /100 = 5.25cm
= 5.25 cm of candle is burnt in one hour (60 min)
= lenght candle burnt in 84 min = 84 / 60 x 5.25 = 7.35 cm
= left over lenght of candle = 08.00
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