18
The average age of a class of 6 girls is x years. Four new girls having ages x – 2, x + 2, x + 4 and x + 6 joins the class. What is the new average age (in years) of the class?
- Ax + 1
- Bx + 2
- C2.5x
- Dx + 2.5
Answer not set
Log in or create a free account to reply and vote.
0
CCommunity
Before adding four new girls, average can be given as
⇒ Sum of age of 6 girls/6 = x
⇒ Sum of age of 6 girls = 6x
After adding age of 4 new girls average can be given as
⇒ New average = Sum of age of 6 girls + x – 2 + x + 2 + x + 4 + x + 6 /(6 + 4)
⇒ New average = (10x + 10)/10
⇒ New average = x + 1
∴ new average is x + 1
⇒ Sum of age of 6 girls/6 = x
⇒ Sum of age of 6 girls = 6x
After adding age of 4 new girls average can be given as
⇒ New average = Sum of age of 6 girls + x – 2 + x + 2 + x + 4 + x + 6 /(6 + 4)
⇒ New average = (10x + 10)/10
⇒ New average = x + 1
∴ new average is x + 1
0
CCommunity
Before adding four new girls, average can be given as
⇒ Sum of age of 6 girls/6 = x
⇒ Sum of age of 6 girls = 6x
After adding age of 4 new girls average can be given as
⇒ New average = Sum of age of 6 girls + x – 2 + x + 2 + x + 4 + x + 6 /(6 + 4)
⇒ New average = (10x + 10)/10
⇒ New average = x + 1
∴ new average is x + 1
⇒ Sum of age of 6 girls/6 = x
⇒ Sum of age of 6 girls = 6x
After adding age of 4 new girls average can be given as
⇒ New average = Sum of age of 6 girls + x – 2 + x + 2 + x + 4 + x + 6 /(6 + 4)
⇒ New average = (10x + 10)/10
⇒ New average = x + 1
∴ new average is x + 1