A man can row 25/2 km an hour in still water and he finds that it takes him thrice as long as long to row down the river. The rate of stream is:
Let the rate of stream be x km/hr Then, Speed of downstream = [(25/2) + x] km/hr Speed of upstream = [(25/2) - x]km/hr [(25/2) + x] = 3 [(25/2) - x] (25/2) + x = (75/2) - x 4x = 25 x = 6.25 km/hr
The average expenditure of a man for the first five month is Rs.14000 and for the next seven months is Rs.12000. If he saves 17000 in that year then fin...
P, Q, R, S and T are five persons. The weight of P, Q and R is 80%, 102% and 84% respectively of the average weight of all five. The ratio of weight of ...
The mean of 50 observations was calculated as 75. It was later found that one of the observations was misread as 173 instead of 113. The correct mean is...
In an examination, the average marks obtained by the students is 80. After correcting the quantitative mistakes, the average of 90 students is reduced t...
The average price of 10 stickers is Rs.12 while the average price of 8 of these stickers is Rs.11.75. Of the remaining two stickers, if the price of one...
In a College with 1200 students, the average age of the boys is 24 years and that of girls is 17 years. If the average age of the college is 22 years an...
A batsman scored 84 runs in his 12th innings, thereby improving his average score per inning by 5 runs. What is the average score per inning of the bats...
The average age of 22 children and their teacher's age are 20 years. If the teacher's age is excluded, the average reduces by 1. What is the teacher's age?
The average of two numbers is 25, and the square root of their product is 20. What is the difference between the two numbers?
Average of 8 numbers is 50. If average of first four and last two numbers is 40 and 35, respectively then find the fifth number given that ratio of fift...
