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Cross multiplication method
Let the cost of electricity for 30 kWh be x sen.
Then,
43.6 x
=
a
c
2 30 If = , then
d
b
2 × x = 43.6 × 30 a × d = b × c.
43.6 × 30
x =
2
= 654
Thus, the cost of electricity consumption for 30 kWh is RM6.54.
CHAPTER
4
Self Practice 4.3b

1. In a sports carnival, there are 200 players in 8 rugby teams. Determine the number of
players in 2 teams if each team has the same number of players.
2. During the SEGAK test in the Physical Education lesson, Amir is able to do 60
push-ups in 3 minutes. How many push-ups can Amir do in 5 minutes?
(Assume that Amir does the push-ups at the same rate.)
2
3. A farmer plants three chilli plants per 0.5 m . How many chilli plants can he plant in
an area of 85 m ?
2

4.3 Open the folder downloaded from page vii for extra
questions of Mastery Q 4.3.

1. Write a proportion for each of the following situations. Use a suitable variable to
represent the required information.
(a) Puan Jamilah mixes 175 ml of olive oil and 50 ml of vinegar to make a marinade.
What is the volume of vinegar required if Puan Jamilah uses 300 ml of olive oil
to make the marinade?
(b) A meteorologist used a rain gauge to measure the
amount of rain in a city. He found out that the total
rainfall in the city was 7.8 mm within 3 hours. If the
rainfall continues at the same rate, how long will it
take for the rainfall to reach 11.7 mm?

2. A gear is a simple machine consisting of wheels with teeth. When a large gear rotates
4 times, a small gear will rotate 18 times at the same time. How many times will the
large gear rotate if the small gear rotates 54 times?

3. A gardener spends half an hour to mow and weed the lawn which has a measurement
of 20 m × 15 m. He is paid RM30 per hour. How much is he paid for a lawn which
has a measurement of 40 m × 30 m?

86
Chapter 4

04 TB Math F1.indd 86 11/10/16 12:12 PM