Question

the sum of two numbers is 63. the smaller number is 21 less than the larger number. what are the numbers

Answer 1

42 and 21

Explanation:

Let x and y be the two numbers

the sum of the two numbers is 63

y+x = 63

The difference between the numbers is 21

x-y= 21

so the two equations are :

`\left \{ {{x+y=63} \atop {x-y=21}} \right.`

add both equations to eliminate y

x+y+x-y = 63+21

2x =84

x= 42

y= 42-21 = 21

the two numbers are 42 and 21

Answer 2

Explanation:

I think 21 and 42