Page 261 - Math Smart - 7

Check My

Understanding

A few Singaporean students are visiting Kuala Lumpur. They want to buy
some souvenirs. To convert the prices from Malaysian Ringgit to Singapore
dollar, they use a conversion graph to check the prices.
The line graph below shows the conversion between Malaysian Ringgit
(RM) and Singapore dollars {S$) on a particular day.

Ringgit and Singapore Dollar
4
1

r

r 3
o
0
1 2
Q.
C
If-

4 5 6 7 8 9 10 11
Malaysian Ringgit (RM)

a) Ann is buying a model of the Petronas Twin Towers.
It costs RM 12. Use the graph to work out the cost in
Singapore dollars (S$).
b) John is buying a postcard of Kuala Lumpur.
It costs RM 9. Use the graph to work out the cost in
Singapore dollars {S$).
c) Mary is buying 2 pens. They cost RM 3 each.
What is the cost of 1 pen in Singapore dollars?
How much do 2 pens cost in Singapore dollars?
/! I/'
d) Paul wants to buy 3 bars of chocolate showing the
Petronas Twin Towers. Each chocolate bar costs RM 6.
What is the cost of 1 bar of chocolate in Singapore dollars?
How many do 3 bars of chocolate cost in Singapore dollars?

Think and Share

Let's refer to Question 1. 1 bar of chocolate costs RM 6 and 1 pen costs RM 3.
Jane has RM 20 and wants to buy as many chocolate bars and pens as she can.
She wants to buy at least 1 chocolate bar and 1 pen.
How many combinations of chocolate bars and pens can she buy with RM 20?