Find the value of two numbers is their sum is 21 and their difference is 3

Hello from MrBillDoesMath

  12, 9

Discussion:

Let x be the first number and y the second number. The form the problem statement:

x + y = 21

x - y = 3

Add the two equations. This gives:

(x + x ) + ( y-y) = 21 + 3 =>

2x + 0 = 24 =>

x = 12

Since x -y =3, substituting in the value of x gives,  12 - y = 3 so y = 9

Thank you,

Mr. B

answer:

3 bags of apples and 2 bags of oranges.

step-by-step explanation: