⟩ Among three people, their ages are as follows; first person is thrice the age of third person and twice that of Second person. The average age of all three persons is 55, the smallest person is _______. 1) 28 2) 15 3) 30 4) 72
3) 30
3) 30
On account of 380 observations, first 200 have mean 10 and the average of remaining observations is 20.Find the average of 380 observations? 1) 14.73 2) 14.47 3) 15.50 4) 16
An athlete runs at u km/h for t1 hrs., v km/h for t2 hrs. Find avg. speed of an athlete for entire lap? 1) (ut1+vt2)/(t1+t2) 2) (u+v)t2/(t1) 3) (t1+vt2)/(u+v) 4) (u+v)/(t2+t1)
A train covers a km at an average speed of u km/h and b km at an average speed of v km/h. What is the average speed of the train in kmph for entire journey? 1) (a+b)/(u+v) 2) uv(a+b)/(av+bu) 3) au+bv/u+v 4) (av+bu)/uv(a+b)
The average weight of 40 employees is reduced by 1 kg. Among them 10 employees whose average weight is 20 kg are fired and 10 new employees are hired. Find the average weight of new employee. 1) 17 kg 2) 15.50 kg 3) 16.50Kg 4) 16Kg
Production of wheat in a village is increased from 120 ton to 219 ton in two years. What is the average increase in production per year? 1) 49.50% 2) 34.50% 3) 20% 4) 69%
Mean of first ten even numbers is 1) 13 2) 15 3) 20 4) 11
How much cream milk at Rs. 55 per litre must be mixed with 200 litre of toned milk at Rs. 40 per litre to give an average price of 46 per litre? 1) 8330.33 litre 2) 9320.13 litre 3) 9331.33 litre 4) 9333.33 litre
A college has four sections in class V having 50, 45, 55 and 42 students. The mean marks obtained in English exam are 40, 50, 60 and 45 respectively for the four sections. Find the overall average of the marks. 1) 48.56 2) 49.16 3) 47.36 4) 50.16
A helicopter reached destination from source via four stops. Helicopter reached different stops at different speeds 100, 200, 300 and 400 kmph respectively. What is the average speed of the helicopter in its flight from source to destination? 1) 220 kmph 2) 188 kmph 3) 192 kmph 4) 212 kmph
In a class of 50 student, 20 are girls and rest are boys. Average weight of Girls and Boys are 45kg and 55 kg respectively. Then the mean weight of entire class in kg is 1) 50.50 2) 51.50 3) 50.00 4) 51.00