Question
A sum of ₹7,500 amounts to ₹11,700 in 8 years at a
certain rate of simple interest. Find the rate of interest per annum.Solution
P =7500, A =11700, T=8y SI=A-P=11700-7500 SI=4200, R=? 
= (4200×100)/7500×8 =21/3 =7% R=7%.
Average 20 numbers is ‘x’. If the average of first 12 numbers is 75.5 while average of last 5 numbers is 86.6 and 13th, 14th a...
Four numbers are arranged in ascending order. When the 1st two numbers are increased by the number equal to their position, and the last two numbers (i....
- The average of series 'S3', which consists of 6 consecutive even numbers, is 33. The second term of series 'T3', which consists of 5 consecutive odd number...
Average of 6 numbers is 12. If one number 5 is replaced by 17, find the new average.
The average age of A and B is 22 years. If A is to be replaced by C, the average would be 20 years. The average age of C and A is 23 years. Find the age...
Average of 15 observations calculated by a student was 70 but when he again went through his observations he realised that he took value of three observ...
The average of 6 numbers is 45. If one more number is added, the new average becomes 47. Find the number added.
There are five containers in a truck hold. The weight of the first container is 100 kg and the weight of the second container is 20% higher than the wei...
The average of the present age of 6 members of a family is 42 years. The present age of the youngest member is 12 years. Then what was the average age o...
- Find the square of 'x' if the average of 22, 31, 49, 38, 29, and 'x' is 40.
Relevant for Exams:
