by Nasim
(Bangladesh )
Average age of Dipu and Apu is 22 years. Average age of Dipu and Tipu is 24 years. Age of Dipu is 21 years. What are the ages of Apu, and tipu ?
Let 21 be Dipu's age
Let y be Apu's age
Let z be Tipu's age
Since the average age of Dipu and Apu is 22 years, we get
(21 + y)/2 = 22
Since the average age of Dipu and Tipu is 24 years, we get
(21 + z)/2 = 24
All we need to do now is to simplify the equations by getting rid of the denominator of 2.
For (21 + y)/2 = 22, just multiply both sides by
we get 21 + y = 44
21 + y = 44
Subtract 21 from both sides
21 - 21 + y = 44 - 21
y = 23
For (21 + z)/2 = 24, just multiply both sides by
we get 21 + z = 48
21 + z = 48
Subtract 21 from both sides
21 - 21 + z = 48 - 21
z = 27
Apu's age is 23
Tipu's age is 27
Jul 20, 17 10:41 PM
A water tank is emptied at a constant rate. Initially, 36,000 gallons of water were in the tank. A the end of five hours, 16,000 gallons remained. How
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Jul 20, 17 10:41 PM
A water tank is emptied at a constant rate. Initially, 36,000 gallons of water were in the tank. A the end of five hours, 16,000 gallons remained. How