1. (a) A typist types 1800 words in 1 hour. Find the
number of words that she can type per minute.
(b) If $120.99 is charged for 654 units of electricity
used, find the cost of one unit of electricity.
(c) A man pays a total of $4800 in flat rental
for 3 months. Find his monthly rental rate.
(d) If the mass of a metal bar which is 3.25 m long
is 15 kg, find its mass per metre.
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Answer:
Answer 1 :
Words written in 1 hour - 1800
Therefore, words written in one minute
= 1800 ÷ 60 = 30 words
Answer 2 :
Cost for 654 units - $120.99
Therefore, cost of one unit
= 120.99 ÷ 654 = 0.185
Answer 3 :
Rent for 3 months - $4800
Therefore, rent for one month
= 4800 ÷ 3 = $1600
Answer 4 :
Mass of 3.25 m long brick - 15kg
Therefore, cost of one metre of metal brick
= 3.25 ÷ 15
= 25% of 5
= 1.25m
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