Ratios And Rates Worksheet - Chapter 3 Page 27
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38A
Checking
You are asked to solve this problem:
1.
4 km
= distance
Marlene can run 4 km in 30 min. Can she run 6 km in 45 min?
30 min
time
Complete the calculation and explanation. Use the
Communication Checklist to help you.
I know that Marlene
runs 4 km in 30 min. I can
B
Practising
write a proportion to
2.
Mahrie was given this problem to solve:
show this information.
Sam has a part-time job delivering flyers. He earns 25¢ for
every 10 flyers he delivers. He needs $45 to buy his mom’s
birthday gift. How many flyers must he deliver?
Mahrie wrote this. How would you improve her explanation?
45 x 4 = 180 ➙ 1800 flyers
The capacity of a glass is 270 mL, and the capacity of a
3.
Thermos flask is 1 L. Akeem said the ratio 270 :1 compares
the capacity of the glass with the capacity of the Thermos. Is
he correct? Explain.
Raisins in a bulk-food store are priced as shown.
4.
golden raisins
A recipe calls for 500 g of raisins. How much money will
a)
$0.66
/
100 g
you save if you buy the cheaper raisins? Explain.
Raj bought $3.63 worth of one kind of raisins.
b)
dark raisins
What was the mass in grams?
$0.55
/
100 g
Is there more than one answer to part b)? Explain.
c)
Jake downloaded three files, all at the same rate. The 1600 KB
5.
file downloaded in 14 s. The other two files downloaded in 21 s
and in 10.5 s. About how large are the other two files? Explain.
6.
A school district report says its student-to-teacher ratio is
21:1. The district has 50 teachers and 1280 pupils. Is the
report accurate? Explain.
Without solving, say which is greater, the solution to
7.
■
■
8 :10
20 :
or the solution to 8 :10
: 20. Explain.
8.
In Ellen’s school, four boys play sports for every three girls who
play sports. Can there be exactly 80 girls who play sports?
128
Chapter 3
NEL
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