There are three numbers such that the first number is 3 times the second number and the second number is half of the third number. Their average is 60. The third number is:
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 60.
Given:
The first number is 3 times the second number and the second number is half of the third number.
Their average is 60
Formula used:
Average = Sum of observation/number of observation ---- (1)
Calculations:
Let the third number be 2x
According to the question,
Second number = x
First number = 3x
Using equation (1), we get
⇒ 60 = (3x + x + 2x)/3
⇒ 6x = 180
⇒ x = 30
Third number = 2x = 2 × 30 = 60