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ATQ, Initial sum of ages of the guest in the party = 21 × 30 = 630 years New average age of the guest = 21 - (12/12) = 21 - 1 = 20 years New sum of ages of the guest in the party = 20 × 34 = 680 years So, the sum of ages of the guest who joined the party = 680 - 630 = 50 years So, the required average = (50/4) = 12.5 years
The population of a town increased to 13,520 in 2022 at a rate of 4% per annum. Find the population of that town in 2020.
A company has two employees, Employee A and Employee B. Employee A earns 180,000 annually, and Employee B earns 210,000 annually. If Employee A’s sala...
31.5 ÷ 1.75 × 6 – 12 = ? + 34
The average age of 4 children is 12 years. The difference between the ages of the eldest and the youngest child is 10 years. If the second and third chi...
The height of a right circular cone is 7 cm, and its volume is 733(1/3) cm³. Determine the diameter of the cone.
24.5% of 400 + 528 of 12.5 ÷ 11
A square prism has a base side of 10 cm and a height of 15 cm. If a cone with the same base and height is removed from the prism, what is the volume of ...
Evaluate the area under y = 2x + 1 between x = 0 and x = 3:
A boat can travel 225 km downstream in 5 hours. If the speed of the boat in still water is 7 times the speed of the stream, how m...
120 litres of mixture contains water and milk in the ratio 5:6 respectively. If 32 litres of the mixture is replaced by same quantity of water, then fin...
