Online Test — Ratios & Proportions (Advanced)
10 Questions • 20 min • Chapter MCQ
20:00
Question 1 of 10
easy
Solve: 3/4 = 9/x
6
8
12
15
Explanation: 3x = 4 x 9 = 36, so x = 12.
Question 2 of 10
medium
A car travels 120 km in 2 hours. At the same rate, how far in 5 hours?
240 km
300 km
360 km
480 km
Explanation: 120/2 = x/5 => 2x = 600 => x = 300 km
Question 3 of 10
easy
A $200 jacket is 30% off. What is the sale price?
$60
$140
$170
$200
Explanation: Discount = 200 x 0.30 = $60. Sale price = 200 - 60 = $140.
Question 4 of 10
medium
If 5 notebooks cost $15, how many can you get for $45?
9
12
15
18
Explanation: 5/15 = x/45 => 15x = 225 => x = 15 notebooks
Question 5 of 10
easy
A $120 item has 6% tax. What is the total cost?
$7.20
$113.80
$126.00
$127.20
Explanation: Tax = 120 x 0.06 = $7.20. Total = 120 + 7.20 = $127.20.
Question 6 of 10
medium
A store buys a watch for $40 and marks it up 50%. What is the selling price?
$20
$40
$60
$80
Explanation: Markup = 40 x 0.50 = $20. Selling price = 40 + 20 = $60.
Question 7 of 10
medium
On a scale drawing, 2 cm = 10 m. What is the actual length of 7 cm on the drawing?
14 m
20 m
35 m
70 m
Explanation: 2/10 = 7/x => 2x = 70 => x = 35 m
Question 8 of 10
medium
A phone price drops from $500 to $400. What is the percent decrease?
10%
20%
25%
100%
Explanation: (500-400)/500 x 100 = 100/500 x 100 = 20%
Question 9 of 10
hard
3 painters paint a house in 8 days. How many days for 6 painters?
2 days
4 days
6 days
16 days
Explanation: Inverse proportion: 3 x 8 = 6 x d => 24 = 6d => d = 4 days
Question 10 of 10
hard
A shirt costs $45 after a 10% discount. What was the original price?
$40.50
$49.50
$50
$55
Explanation: 0.90 x Original = 45 => Original = 45 / 0.90 = $50