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The average of three numbers is 15 . The average of the second and the third number is 12.5 . What is the first number? |
18 21 24 20 |
20 |
Sum of three numbers = 15 x 3 = 45 Sum of 2nd and third number= 12.5 x 2 = 25 First number = 45 - 25 = 20 |
