Question
Ramesh and Rahman can do a work in 20 and 25 days
respectively. After doing collectively 10 days of work, they leave the work due to illness and Suresh completes rest of the work in 3 days. How many days Suresh alone can take to complete the whole work ?Solution
Ramesh               Rahmaan 20                         25               100 5                           4 Total work =100 Work done by Ramesh and Rahman in 10 days = (5 + 4) x 10 = 90 Remaining work = 100-90 = 10 Let the efficiency of Suresh be x, then = 3x = 10 = x = 10/3 Suresh complete the whole work in = 100/(10/3) = 10 x 3 = 30 days
If the length of a rectangle is increased by 60%, what would be the percentage decrease (correct to the nearest integer) in the width to maintain the s...
In a college, 70% of the students opted for cultural activities. Among those, 50% participated in music events and the remaining 105 students took part ...
- The cost of tea increased by 25%, so Meena reduced her consumption by 20%. Calculate the percentage change in her expenditure on tea.
A person spent 12.5% of his monthly income on food and 32% of the remaining on rent. If amount spent on rent is Rs 1512, then find the amount spe...
The monthly salary of a person is Rs.30000. He spent a% on rent and (a+5)% on EMI. From the remaining, he spend 45% on Education. Find amount spent on E...
- Anita had 320 candies and Rina had 40 more candies than Anita. Anita gave away 25% of her candies while Rina gave away 35% of hers. How many more/less cand...
A student scores 360 marks out of 600 marks in an examination. Find his percentage of marks.
The population of a city is decreased by 15% in the first year and then increased by 20% in the second year. Find the population of the city at the end...
 In a lock-making factory, 10 percent of the total produced locks were found to be defective, and 80 percent of the non-defective locks were exported. ...
Ravi spends 75% of his monthly salary. If his monthly savings are Rs 6,500, what is his monthly salary?
