Page 282 - Math Smart - 7

Example 3

Find the following values.

a) 6% of 25 m b) 15% of 280 kg c) 28% of 300 I d) 54% of 420 g

Solution
3 1 3 14
a) 6% of 25 m b) 15% of 280 kg
.Mn)

2 1
_ 3 = 3 X 14
2
= 42 kg
= 1r m
21
X
_ ^
c) 28% of 300/ = X 30e d) 54% of 420 9 = ^ 42e
iecr
= 28 X 3 _ 54 X 21
5
= 84/ _ 1134
5
= 226fg

Example 4

There are 64 seats in a restaurant. 75% of the seats are occupied. How many seats
are not occupied?

Solution

Method 1 Method 2
Find the number of seats that are occupied. Find the percentage of seats that are not occupied.
"I 100%-75% = 25%
3 16
75% of 64 =^XM' Find 25% of the seats in the restaurant.
^ 1 16
25% of 64= ^x^
1
= 3 X16
= 48
1
Find the number of seats that are not occupied. = 16
% 64-48= 16
So, 16 seats are not occupied.
So, 16 seats are not occupied.

UNIT 12 I Percentages