IMO Level 1- Mathematics Olympiad (SOF) Class 10: Questions 405 - 410 of 968
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Question number: 405
Question
The mean of 20 observations is. if each observation is multiplied by 2, then what is the new mean?
Choices
| Choice (4) | Response | |
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| a. | 30 |
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| b. | 60 |
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| c. | 70 |
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| d. | 50 |
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Question number: 406
Question
A box contains 40 balls of two different colours, out of which x are black. One ball is drawn at random. If 20 more black balls are put in the box, the probability of drawing a black ball now will be double that of the previous probability of drawing a black ball. Then, the value of x is ________
Choices
| Choice (4) | Response | |
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| a. | 12 |
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| b. | 10 |
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| c. | 15 |
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| d. | 14 |
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Question number: 407
Question
A Motor maintains an average speed of 70 km/hr while going from P to Q and maintains an average speed of 85 km/hr while coming back from Q to P. the average speed of the motor is ________.
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Question number: 408
Question
is three vertices of the parallelogram PQRS. The coordinates of fourth vertex is ________
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Question number: 409
Question
Four vertices of a parallelogram taken in order are. What will be the ratio of a and b?
Choices
| Choice (4) | Response | |
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| b. | 1: 9 |
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| c. | 2: 9 |
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| d. | 3: 7 |
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Question number: 410
Question
PQR is an isosceles triangle. If the coordinates of the base are , then the coordinates of the vertex P can be
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| d. | None of the above |
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