Number-related problems

Answer 1

wat ?

Answer 2

When the first two numbers is added to twice the second the result is 21, but when the second number is added to twice the first, the result is 18. Find the two numbers.


let
   x= smaller number
   y= larger number

solve:

equation 1  : X+2y=21
equation 2  : y+x=18  

rearrange the equation 2 and the it will be x+y=18 then add

x+2y=21
x+y=18
_______

3y=39
_______
3

= y = 13

then lets solve for x ... substitute 13 to equation 2 it will be..

y(13)+x =18
13+x=18
x = 18-13
x = 5

(5,13)

check

substitute 5 and 13 to equation 2

13 + 5 = 18
     18= 18
(correct)

Answer 3

When the first two numbers is added to twice the second the result is 21, but when the second number is added to twice the first, the result is 18. Find the two numbers.

Answer 4

When the first two numbers is added to twice the second the result is 21, but when the second number is added to twice the first, the result is 18. Find the two numbers.