Aman was asked to find the average of n consecutive numbers starting from 1, but he added a number twice, then the wrong average calculated was Find the number that was added twice.
Atul has twice as much money as Abhishek. Abhishek has 20% more money than Rohit. If the average money with them is Rs 115, then Rohit has-
The average age of 40 students of a class is 15 years 3 months. Due to admission of 5 new students average becomes 15 years. If the age of the younger one is 10 years, find the average of remaining four students.
Find the highest power of 7 that divides 57! completely?
After replacing an old student by a new student, who is three years old, it is found that the average age of a group of 10 students is the same as it was 6 months ago. Find the difference between the ages of replaced and new students.
How many kg of sugar worth Rs 40/kg should be mixed with 15 kg of sugar worth Rs 32 / kg, such that by selling the mixture at Rs 42/kg, there may be a gain of 20%?
Average of 10 numbers is calculated as 21. Later it was found that one number was wrongly written as 26 instead of 16. Find the correct average.
30 kg of an alloy A is mixed with 50 kg of an alloy of B. If alloy A has copper and aluminium in the ratio 3 : 2 and alloy B has aluminium and tin in the ratio 1 : 4, find amount of aluminium in the new alloy.
A and B represents the numbers of even and odd factors of 120 respectively. Find the ratio between A and B.
Find the number of co-primes of 36, less than 36
A mixture containing 5 litres of water and certain quantity of milk worth ₹ 30 per litre. If pure milk worths ₹ 40 per litre, how much milk is there in the mixture ?
In a class of 40 students, the average age of boys is 20 years and the average age of girls is 18 years. The fraction of girls out of the total students of the class is:
How many factors of 196 are perfect square ?
Find the Sum of all the factors of 150.
A sum of Rs 210 is to be divided among 40 students. If each boy gets Rs 4 and each girl gets Rs 6, find the no. of boys.
