The average height of 25 boys is 1.4 m. When 5 boys leave the group, then the average height increased by 0.15 m. What i…

A certain factory employed 600 men and 400 women and the average wage was Rs. 25.50 per day. If women got Rs. 5 less tha…

Nine persons went to a hotel for taking their meals. Eight of them spent Rs. 12 each on their meals and the ninth spent …

A family consists of two grandparents, two parents and three grandchildren. The average age of the grandparents is 67 ye…

A family consists of grandparents, parents and three grandchildren. The average age of the grandparents is 67 years that…

A grocer has a sale of Rs. 6435, Rs. 6927, Rs. 6855, Rs. 7230 and Rs. 6562 for 5 consecutive months. How much sale must …

The average of two numbers is 6.5 and square root of their product is 6. What are the numbers?

The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero?