Speed of the motorboat upstream = 27/(9/4) = 12 km/hr Let the speed of the current be x km/hr ⇒ 16 – x = 12 ⇒ x = 4 km/hr Speed of motor boat downstream = 16 + 4 = 20 km/hr Time taken to cover 27 km at 20 km/hr = 27/20 = 27/20 hours or 1 hour 21 minutes
The average age of a group of seven children is 10 years. From the group, two children, whose ages were 5 years more and 3 years more than the average a...
Average 20 numbers is ‘x’. If the average of first 12 numbers is 72.5 while average of last 5 numbers is 82.2 and 13th, 14th a...
The certain sum amounts to Rs11313.5 in 2(1/2) years at 12% p.a., interest compounded 10 months. The sum (in Rs) is:
The average age of the husband, wife, and their child 3 years ago was 24 years and that of the Wife and the child 5 years ago was 19 years. The present ...
20 students go for a picnic. 10 of them spent Rs. 64 each on their food and rest spent Rs.4 more than the average expenditure of all 20. What was the to...
Average of 20 numbers is 90. Average of first 8 numbers is 125 while average of last nine numbers is 40. If ninth number is 25% less than the tenth numb...
Average weight of a team of 8 persons is 50 kg. When one more person joins the team, the average weight of the team increases by 7 kg. Find the weight o...
There are three distinct numbers ‘a’, ‘b’ and ‘c’. If, a = 150, (a + b) = 450 and (c – b) = 60, then find the average of a, b and c.
...Average run scored by a batsman in 16 innings is 74. In next 6 innings, he scored runs with an average of ‘x’ so that his overall average increases ...
The average score obtained by 27 students in a class test is 68 marks. The top place was shared by 3 people who got the same score. If the lowest score ...
