Question
Average age of a class of 35 students is 15 years.
Average age of the class is increased by 18 months if the age of the teacher is included. Find the age of the teacher.Solution
Sum of the ages of all the students in the class = 35 × 15 = 525 years Sum of the ages of the students along with teacher = 36 × 16.5 = 594 years So the age of the teacher = 594 – 525 = 69 years
A certain amount earns simple interest of Rs. 1480 after 3 years. Had the interest been 5% more, how much more interest would it have earned?
A man borrowed Rs 300 and promised to pay back in 11 equal instalments of Rs 30 each. Find the rate of simple interest per annum?
A man invested Rs. 6,000 at simple interest of 'x%' p.a. and received Rs. 12,000 after 2 years. If he had invested Rs. 30,000 at simple interest of 'x%'...
A sum of money lent at compound interest at the rate of 10% per annum is paid back in three equal instalments of Rs 3,993. Find the sum?
A person invested Rs. 50,000 in scheme A that offers simple interest at 25% p.a. Four years later, they withdrew Rs. x from scheme A and placed it in sc...
A certain sum when invested at compound interest (compounded annually) of 8% p.a. for 4 years, gives an interest of Rs. 4879.20. Calculate the approxima...
An amount of Rs. 'x' is invested at a simple interest rate of 15% per annum and grows to Rs. 14,500 after 3 years. If the same am...
A man invests Rs X in a scheme at 12% rate of interest for 8 years. After 8 years he reinvests the amount received at same rate of interest for same tim...
- Ravi invests Rs. 'x' in scheme X and Rs. (x + 600) in scheme Y for 4 years each. Schemes X and Y offer simple interest at 12% p.a. and 8% p.a. respectively...
The difference of S.I and C.I on an amount of Rs. 40000 for 2 years is Rs. 64. What is the rate of interest?