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How do you determine the ratio or the related LEARNING
value? STANDARDS
Determine the ratio or
11 the related value given
(i) the ratio of two
Nurin’s mother tries a bread recipe by mixing flour with quantities and the
water. The ratio of the flour to the water is 5 : 3. If Nurin’s value of one quantity.
mother has 480 g of flour, what is the mass of water, in g, (ii) the ratio of three
that is needed? quantities and the
value of one quantity.

Unitary method Cross multiplication method
CHAPTER
4
Flour : Water Let m = mass of water needed
5 : 3 Flour : Water
480 g : 5 : 3
480 g : m g
5 parts of flour = 480 g
480 m 480
1 part of flour = Thus, =
5 3 5
= 96 g 5 × m = 3 × 480
3 × 480
Mass of water needed = 3 × 96 g m =
= 288 g 5
= 288
12
In funding a bicycle shelter project, the ratio of the donations contributed by the school
canteen operator, Jaya Bookstore and PIBG is 2 : 6 : 5. If the PIBG had donated RM900,
find the amounts donated by the school canteen operator and Jaya Bookstore respectively.

Unitary method
School canteen operator : Jaya Bookstore : PIBG
2 : 6 : 5
: : RM900

5 parts = RM900
900
1 part =
5
= RM180
School canteen operator Jaya Bookstore
donated 2 parts. donated 6 parts.
Amount donated = 2 × RM180 Amount donated = 6 × RM180
= RM360 = RM1 080

T Try Thisry This Use cross multiplication method to solve Example 12.

88
Chapter 4

04 TB Math F1.indd 88 11/10/16 12:12 PM