Maths Practice Question and Answer
8 Q: If $$ {a\over 3}={b\over3}={c\over4}$$ then find the value of $$ {a+b+c\over c}$$.
1056 061162380a9d47920f2a71796
61162380a9d47920f2a71796- 1$$ {5\over 8}$$false
- 2$$ {5\over 2}$$true
- 3$$ {5\over 7}$$false
- 4$$ {9\over 8}$$false
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Answer : 2. "$$ {5\over 2}$$"
Q: A Cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 9 hours. If both the taps are opened simultaneously then after how much time will the cistern get filled?
1214 0613b17f8a0ff2d3b5e8f7657
613b17f8a0ff2d3b5e8f7657- 16.5 hrsfalse
- 27.2 hrstrue
- 32.5 hrsfalse
- 43 hrsfalse
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Answer : 2. "7.2 hrs"
Q: A man went downstream for 28 km in a motor boat and immediately returned. It took the man twice as long to make the return trip. If the speed of the river flow were twice as high, the trip downstream and back would take 672 minutes. Find the speed of the boat in still water and the speed of the river flow. 54315 05b5cc672e4d2b4197774c0c8
5b5cc672e4d2b4197774c0c8- 112 km/hr, 3 km/hrfalse
- 29 km/hr, 3 km/hrtrue
- 38 km/hr, 2 km/hrfalse
- 49 km/hr, 6 km/hrfalse
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Answer : 2. "9 km/hr, 3 km/hr"
Explanation :
Answer: B) 9 km/hr, 3 km/hr Explanation: Let the speed of the boat = p kmph Let the speed of the river flow = q kmph From the given data, 2 x 28p + q = 28p - q => 56p - 56q -28p - 28q = 0 => 28p = 84q => p = 3q. Now, given that if 283q + 2q + 283q - 2q = 67260=> 285q + 28q = 67260=> q = 3 kmph=> x =3q = 9 kmph Hence, the speed of the boat = p kmph = 9 kmph and the speed of the river flow = q kmph = 3 kmph.
Q: If A: B = 4:5 and B:C= 3: 7 . What is the value of C:A?
1176 060990ddbf738a51c29aa235c
60990ddbf738a51c29aa235c- 112 : 35false
- 235 : 12true
- 37 :4false
- 43 :1false
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Answer : 2. "35 : 12"
Q: A train moving at speed of 90 km/hr crosses a pole in 7 seconds. Find the length of the train.
43514 05ee3067ef72c0e153c80603f
5ee3067ef72c0e153c80603f- 1150 mfalse
- 2165 mfalse
- 3175 mtrue
- 4170 mfalse
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Answer : 3. "175 m"
Q: In a factory, the production of cycles rose to 48,400 from 40,000 in 2 years. The rate of growth per annum is?
1238 060057306d517b811ff78e83a
60057306d517b811ff78e83a- 110.5%true
- 29%false
- 38%false
- 410%false
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Answer : 1. "10.5%"
Q: If diagonals of a rhombus are 16 cm and 30 cm. then what is the perimeter (in cm) of the rhombus?
1339 0600ab66cbc7633585f494843
600ab66cbc7633585f494843- 132false
- 264false
- 334false
- 468true
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Answer : 4. "68"
Q: The total cost of 18 pens and 23 pencils is Rs. 231, while the total cost of 7 pens and 13 pencils is Rs. 102. What is the cost of 4 pens and 9 pencils?
1600 16123723818a73e14f5bbeda6
6123723818a73e14f5bbeda6- 154false
- 2108false
- 372false
- 463true
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