Question

The sum of two numbers is 51. Their difference is 13. What is the smaller of the two numbers ? A . 18 B. 19 C. 20 D. 21 ?

Answer 1

x+y=51
x-y=13
find y

Answer 2

\[x+y=51\]
\[x-y=13\] add to get
\[2x=64\]
\[x=32\]

Answer 3

yeah x=32
then y=32-13=19

Answer 4

x+y=51
x-y=13

=>2y=51-13
=>y=38/2
=>y=19

Answer 5

TL:DR
B is the answer