IMO Level 1- Mathematics Olympiad (SOF) Class 8: Questions 570 - 576 of 1040
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Question number: 570
» Direct and Inverse Proportions
Question
If 4 men take an hour to dig a ditch, how long should it take 10 men to dig a ditch of the same type?
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 23 min |
|
| b. | 20 min |
|
| c. | 30 min |
|
| d. | 24 min |
|
Question number: 571
Question
Number of prime factors in is
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 20 |
|
| b. | 22 |
|
| c. | 23 |
|
| d. | 28 |
|
Question number: 572
» Direct and Inverse Proportions
Question
If A: B = 3: 4 and B: C = 5: 6, then C: A is equal to, ________.
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 24: 15 |
|
| b. | 12: 23 |
|
| c. | 15: 14 |
|
| d. | 25: 14 |
|
Question number: 573
Question
The value of when is________.
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 85 |
|
| b. | 84 |
|
| c. | 80 |
|
| d. | 81 |
|
Question number: 574
» Direct and Inverse Proportions
Question
A cistern has two inlets A and B which can fill it in 10 minutes and 20 minutes respectively. An outlet C can empty the full cistern in 4 minutes. If all the pipes are opened together in the empty tank, time taken to fill the tank completely is ________.
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 20 minutes |
|
| b. | 10 minutes |
|
| c. | 15 minutes |
|
| d. | 25 minutes |
|
Question number: 575
Question
Number of prime factors in is
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 60 |
|
| b. | 70 |
|
| c. | 66 |
|
| d. | 73 |
|
Question number: 576
» Direct and Inverse Proportions
Question
A water tank is two-fifth full. Pipe A can fill a tank in 12 minutes and pipe B can empty it in 6 minutes. If both the pipes are open, how long will it take to empty or fill the tank completely?
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 5 minutes |
|
| b. | 4 minutes |
|
| c. | 5.5 minutes |
|
| d. | 4.8 minutes |
|