Let speed of boat in upstream and downstream be ‘7x’ km/h and ‘9x’ km/h respectively. 91/7x + 126/9x = 9 13/x + 14/x = 9 27 = 9x x = 3 Speed of boat in still water = (7x + 9x)/2 = 8x = 8 × 3 = 24 km/h Desired time = 180/24 = 7.5 hours
A person spent 20% of his monthly income on food and 65% of the remaining on rent. If amount spent on rent is Rs 1047.80, then find the amount spent on ...
Initially, a person spends 65% of his salary and saves the remainder. When his salary is increased by 40%, his savings remain unchanged, and he finds th...
Arun saves 30% of his salary while Gagan saves 32%. If both get the same salary and Gagan saves Rs. 1600, find the savings of Arun?
Person P allocated 35% of his salary to his son for school fees. From the remaining amount, he saved 40% in his bank account. The...
60 percent of the voters promised to vote for A and the rest promised to vote for B. Of these, on the last day 30 percent of the voters went back on th...
Suyash have total amount of Rs.2500 out of which, he spent 25% on food, 40% of the rest on travelling. Out of remaining amount he spends Rs.540 on misce...
The value of A’s car is depreciating by 25% every year whereas the value of his house is appreciating by 15% each year as compared to the previous yea...
A Company allow 8% commission on the total sales to its salesman but if the salesman is appointed on a fix salary of Rs. 10000 and 6% commission on the...
A money lender finds that due to a fall in the annual rate of interest from 10% to 8(3/4)%, his year's income diminishes by ₹84.50. Find his capital.
The radius of a circle is increased by 20%. Find the percentage increase in the area of the circle.
