Question

The difference of two numbers is 3. Their sum is 21. What are the two numbers

Answer 1

Answer:

Step-by-step explanation:

LET THE NUMBERS BE X,Y

GIVEN THAT X+Y=21

X-Y=3

SUBSTITUTE X=Y+3 IN X+Y=21

THAT IS Y+3+Y=21

2Y=18

THEREFORE Y=9,X=12

Answer 2

Answer:

12, 9

Step-by-step explanation:

let take that two numbers x, y

x - y = 3

$x - y = 3 - - > (1) \\ x + y = 21 - - > (2)$

add eqn 1&2,

2x = 24

x = 12

substitute x value in eqn 2,

12 + y = 21

y = 21-12

y = 9

so that two numbers are 12 & 9