Hi,

Question States***

 x + y = 21    and y = 2x

 x + 2x = 21       |Substituting 2x  for y

   3x = 21

    x = 7, the smaller number.  14 the larger number  

RELATED QUESTIONS

The sum of two numbers is 48, and one number is twice the other. Find the... (answered by Cromlix)

 The sum of two numbers is 26 and one number is five more than twice the other. Find the... (answered by josgarithmetic)

The sum of two numbers is 24, and one is twice the other. find the numbers.
    (answered by jojo14344)

The sum of two numbers is 70. One number is ten more than twice the other number. Find... (answered by london maths tutor)

The sum of two numbers is 9. One number is 3 less than twice the other. Find the two... (answered by josmiceli)

The sum of two numbers is 47. One number is 5 more than twice the other number. Find the... (answered by Wingsong,Alan3354)

The sum of two numbers is 100.  One number is 5 less than twice the other.  Find the... (answered by fractalier)

The sum of two numbers is 15.  Twice one number equoals three times the other.  Find the... (answered by Earlsdon,josmiceli)

the sum of two numbers is 13. one number is 1 more than twice the other. find the... (answered by Mathtut)