Direct and Inverse Proportions (IMO Mathematics Olympiad (SOF) Class 8): Questions 28  34 of 62
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Question number: 28
» Direct and Inverse Proportions
Question
A bag contains 25 paise, 10 paise and 5 paise coins in the ratio 1: 4: 5. If their total value is Rs. 90, the number of 10 paise coins is ________.
Choices
Choice (4)  Response  

a.  400 

b.  500 

c.  800 

d.  600 

Question number: 29
» Direct and Inverse Proportions
Question
If A: B = 1: 4 and B: C = 3: 5, then C: A is equal to, ________.
Choices
Choice (4)  Response  

a.  24: 15 

b.  25: 14 

c.  3: 20 

d.  20: 3 

Question number: 30
» Direct and Inverse Proportions
Question
can do a piece of work in 70 days. He works at it for 7 days and then alone finishes the work in 40 days. The two together could have completed the work in ________.
Choices
Choice (4)  Response  

a.  30 days 

b.  23.8 days 

c.  20.5 days 

d.  23 days 

Question number: 31
» Direct and Inverse Proportions
Question
Two pipes A and B can fill a tank in 12 and 24 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank?
Choices
Choice (4)  Response  

a.  2 minutes 

b.  6 minutes 

c.  5 minutes 

d.  8 minutes 

Question number: 32
» Direct and Inverse Proportions
Question
An agent receives a commission of Rs. 50.00 on sales of Rs. 3500.00. The commission he get on sales of Rs. 300.00 is________.
Choices
Choice (4)  Response  

a.  Rs 4.00 

b.  Rs 3.50 

c.  Rs 4.28 

d.  Rs 2.87 

Question number: 33
» Direct and Inverse Proportions
Question
If A: B = 2: 3 and B: C = 3: 5, then C: A is equal to, ________.
Choices
Choice (4)  Response  

a.  2: 3 

b.  4: 5 

c.  5: 2 

d.  5: 4 

Question number: 34
» Direct and Inverse Proportions
Question
0.9 of a number equals 0.03 of another number. The ratio of the number is________.
Choices
Choice (4)  Response  

a.  10: 3 

b.  1: 30 

c.  3: 10 

d.  3: 20 
