Question

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 . )

# 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

Solution