Short Quiz in Math 9 solves problems involving variation

Mathematics

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M9AL-IIb-c-1

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5 questions
• Q1
If y is directly proportional to x and y=15 when x=12, what is the value of y when x=16?
20.0
12.8
16.4
13.0
30s
M9AL-IIb-c-1
• Q2
If n is inversely proportional to the square of p and n=10 when p=2, what is the value of n when p=4?
10
20
2.5
5
30s
M9AL-IIb-c-1
• Q3
The distance a car travels (d) varies directly with the speed of the car (r). If m is the constant of proportionality, which formula could represent this relationship?
d = mr
r = md
d = m/r
r = m2/d
30s
M9AL-IIb-c-1
• Q4
The time required to complete a job varies inversely with the number of people working. If it took 5 painters 3 days to paint a house, how long would it take 1 painter?
15 days
3/5 day
8 days
5/3 day
30s
M9AL-IIb-c-1
• Q5
Suppose c varies jointly with a and b. If c=25 when a=2 and b=2.5, what is the value of b when c=40 and a=6?
20/3
5
6
4/3
30s
M9AL-IIb-c-1

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