Bob paid 3 less than Tim for his lunch at a local pizza parlor. Together they spent $7.80. How much did Bob spend for his lunch?
2006-08-15 05:16:25 · 23 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Bob spent $2.40
2006-08-19 02:07:25 · answer #1 · answered by Joe Mkt 3 · 2⤊ 0⤋
I really do not get this question because if you just subtract 3 from 7.80 you get 4.80 which is not 3 less than what tim spent on lunch the 4.80 is 3 less than the whole total they spend together. So 4.80 is not 3 less than what tim spent it is 3 less than the total they spent over all. I do not know how to get 3 less than what tim spent if the total between bob and tim is 7.80. I would need to know what tim spend on lunch by him self.
2006-08-15 12:32:25 · answer #2 · answered by sparkles_0604 3 · 0⤊ 0⤋
Tim is x. Bob is x-3. The sum of the two is 7.80. Write that last one as an equation. Solve for x. That's Tim. Subtract 3 to get Bob.
2006-08-15 12:21:19 · answer #3 · answered by Anonymous · 1⤊ 0⤋
If you mean $3 less, then this is the answer:
Bob = x
Tim = (x + 3)
x + (x + 3) = $7.80
2x + 3 = $7.80
2x = $4.80
x = $2.40
Bob spent $2.40
If you mean 3 Cent less, then this is the answer:
Bob = x
Tim = (x + 3)
x + (x + 0â03) = $7â80
2x + 0â03 = $7.80
2x = $7.80 - 0â03
2x = $7.77
x = $3â885
Bob spent $3â885
2006-08-15 12:39:49 · answer #4 · answered by Brenmore 5 · 0⤊ 0⤋
Let the amount Tim paid be x
and that Bob paid be x - 3
According to the question the total amount paid is $ 7.80
Therefore,
x + (x - 3) = 7.80
2x - 3 = 7.80
2x = 7.80 + 3
2x = 10.80
x = 10.80 / 2
x = 5.40
Therefore , Tim paid $ 2.40 for his lunch.
Hence Bob paid $ 7.80 - 5.40 = $2.40 for his lunch.
2006-08-15 12:31:45 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Let x = Tim's lunch expense
And both lunches add up to 7.80... (Bob's lunch is just x - 3)
This is expressed mathematically as below...
x + (x-3) = 7.80
2x - 3 = 7.80
2x = 10.80
x = 5.40
x-3 = 2.40
so Bob spent $2.40
and Tim spent $5.40
2006-08-15 12:20:48 · answer #6 · answered by AresIV 4 · 2⤊ 0⤋
Bob = x + 3 (to equal Tim)
T= 7.80
x + 3 = 7.80
x = 7.80 - 3
x = 4.80
Bob spend $4.80
2006-08-15 12:23:12 · answer #7 · answered by t_nguyen62791 3 · 0⤊ 1⤋
If by "3 less" you mean "$3 less", then:
B=T-3
T=B+3
B+T=7.80
Combining...
B+(B+3)=7.80
2B+3=7.80
2B=4.80
B=2.40
...so Bob spent $2.40 for his lunch (and Tim paid $5.40).
2006-08-15 13:32:32 · answer #8 · answered by stellarfirefly 3 · 0⤊ 0⤋
B + T = 7.80
B = T - 3
(T -3) + T = 7.80
2T = 10.80
T = 5.40
B = 5.40 - 3
B = 2.40
2006-08-15 12:27:01 · answer #9 · answered by Krzysztof_98 2 · 0⤊ 0⤋
Zero, Bob is cheap, and Tim bought.
2006-08-15 12:22:43 · answer #10 · answered by I'm Batman 2 · 0⤊ 2⤋