17. If one number is thrice the oth...
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
74
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 . )