Question

Bob paid $3. Less than Tim at a local pizza parlor. together they spent $7. 80. How much did Bob spend at the local pizza parlor?

Answer 1

x-3+x=7.80

Answer 2

B + T = 7 -- together they paid 7
B = T - 3 -- bob paid 3 less then tim

now we sub T - 3 in for B in the first equation
T - 3 + T = 7 -- combine like terms
2T - 3 = 7 -- add 3 to both sides
2T = 7 + 3
2T = 10 -- divide both sides by 2
T = 5

B + T = 7
B + 5 = 7
B = 7 - 5
B = 2

check..
B = T - 3
2 = 5 - 3
2 = 2 (correct)

Bob spent $2 and Tim spent $5.....doesn't sound fair to me...lol