Question

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.​

Answer 1

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