Question

(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

SOLUTION

TO DETERMINE

(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.

EVALUATION

(a) A typist types 1800 words in 1 hour.

Hence the number of words that she can type per minute

$\displaystyle \sf{ = \frac{1800}{60} \: \: words }$

$\displaystyle \sf{ = 30 \: \: words }$

(b) $120.99 is charged for 654 units of electricity used,

The cost of one unit of electricity

$\displaystyle \sf{ = \frac{120.99}{654} \: \: }$

= $ 0.185

(c) A man pays a total of $4800 in flat rental for 3 months.

Hence the monthly rental rate

$\displaystyle \sf{ = \frac{4800}{3} \: \: }$

= $ 1600

(d) If the mass of a metal bar which is 3.25 m long is 15 kg,

Hence its mass per metre.

$\displaystyle \sf{ = \frac{15}{3.25} \: \: }$

= 4.61538462 kg/m

≈ 4.62 kg/m

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