Question
The average age of a group of 20 persons is found
to be 25 years. Later it is found that age of two of the persons is calculated as 30 and 60 instead of 70 and 20. Find the correct average age of the group.Solution
Required average = {(20 × 25) – 30 – 60 + 70 + 20}/20 = 25 years
Three numbers a, b and c are co-prime to each other such that ab = 88 and bc = 33. Find the value of (a + b + c).
The greatest number, which when subtracted from 1063, gives a number exactly divisible by each of 15, 20, 30 and 35, is:
Find the difference between sum of digits of LCM and HCF of 16, 40 and 64.
Three numbers a, b and c are co-prime to each other such that ab = 70 and bc = 45. Find the value of (a + b + c).
- Three numbers are in the ratio 7:2:3 respectively. If the HCF of the numbers is 6, then find the LCM of the numbers.
Find the smallest number which when divided by 3, 4, 5 and 6 gives remainder ‘2’ in each case?
The LCM of two numbers is 4 times of their HCF. The sum of LCM and HCF is 280. If one of the number is 224, then the other number is:
Three numbers are in the ratio 5:3:2 respectively. If the HCF of the numbers is 4, then find the LCM of the numbers.
Sum of the two numbers is 49 and their HCF and LCM are 7 and 70, respectively. Find the sum of reciprocal of the given two numbers.
- What is the unit digit of the number 'A' obtained by subtracting the largest two-digit prime number from the least common multiple (LCM) of all single-digi...
