Question

17. If one number is thrice the other and their sum is 20, then the numbers are (1) 5, 15 (2) 4, 12 (3) 3,9 (4) None of these

11th - 12th Class

Maths

Solution

5.0 (1 ratings)

17. (1) Let the two numbers be ( x ) and ( y ). ( therefore quad x=3 y ) and ( x+y=20 ) ( Rightarrow ) ( 3 y+y=20 ) ( begin{aligned} Rightarrow & & 4 y &=20 Rightarrow & & y &=5 text { and } x=15 end{aligned} ) Hence, two numbers are 5 and ( 15 . )