Question
In a classroom there are 14 boys and 11 girls. Average
age of each boy and each girl is 21 years and 15 years respectively. The sum of ages of all the boys, girls and a teacher whose age is ‘x’ years is 500 years. Find the value of ‘x’.Solution
Sum of ages of all boys = 14 x 21 = 294 Sum of ages of all girls = 11 x 15 = 165 So, 294 + 165 + x = 500 => x = 41
Let N be the greatest number that will divide 78, 109, 140 leaving the same remainder in each case. Then sum of the digits in N is:
LCM and HCF of two numbers are respectively 3 and 18. If one of them is 9, find the other number.
What is the difference between the LCM and HCF of 36, 40?
Rohit spends an average of Rs. 500 on Sundays and Rs. 350 on the remaining days. Find his average spending in a 30-day month starting with Sunday.
The ratio of two numbers is 12:14 and their LCM is 168. The numbers are:
- Determine the difference between the LCM and HCF of the numbers 15, 25, and 50.
If the product of two numbers is 560 and their HCF is 8, find the LCM of those two numbers.
What are the Highest Common Factor and Lowest Common Multiple of 6, 72, 120?
Let N be the greatest number that will divide 85, 112, 139 leaving the same remainder in each case. Then sum of the digits in N is:
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