Question

7. Average of three numbers is 28. If the first number be the half of the second number and the third number be the double of the second number. Find the third number. (1) 12 (2) 24 (3) 36 (4) 48

11th - 12th Class

Maths

Solution

393

2.7 (3 ratings)

7. (4) Let the second number be ( x ). Then. first number ( =frac{x}{2} ) and third number ( =2 x ) According to the question, [ frac{frac{x}{2}+x+2 x}{3}=28 ] ( Rightarrow quad frac{x}{2}+3 x=84 ) ( Rightarrow quad frac{7}{2} x=84 Rightarrow x=24 ) Thus, third number ( =2 x=2 times 24=48 )