A boy can swim a certain distance downstream in 5 hours and return in 7 hours. If the rate of stream is 3 kmph then what is the speed of boy in still water?
Let the speed of the boy in still water be x kmph. Then, (x + 3) × 5 = (x – 3) × 7 => 5x + 15 = 7x - 21 => 2x = 36 => x = 18 kmph
The population of the town is 270,000 4/9th of them are males and the rest are females. 50% males and 40% females are married. Find the unmarried popula...
A spent 25% of his monthly income on study and 60% of the remaining on rent. If amount spent on rent is Rs. 945, then find the amount spent on study
In a school, the average number of books that some numbers of boys have is 100 and average number of books that some numbers of girls have is 70. If eac...
In an election between two candidates, winner got 40% of total valid votes. If total number of votes cast were 1000 out of which 6% were invalid, then f...
The income of Tina is Rs.26000 and she saves 30% of her income. The savings of Kajal is Rs.3000 more than that of Tina and she spends 60% of her income....
Monthly income of A is Rs. 75000 out of which he spent 23%, 16% and 28% of his total income in rent, medicine and transportation, respectively. Find his...
A plane can travel 36 km against the wind and 80 km with the wind in 4 hours. How much percent is the speed of the plane against the wind less than the ...
There are two slabs of income tax, 8% tax for income up to 3 lakh and 12.5% for income above 3 lakh. Akhil tried to evade tax by hiding some of the inco...
If 45% of a number is 90, what is 60% of the same number?
Rajesh spent 45% of his monthly income on food and 55% of the remaining of study. If total monthly savings (after spending on food and study) of Rajesh ...
