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Three slices of pizza and a salad cost $6.45. Six slices of
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23 Jan 2018, 14:58
23 Jan 2018, 14:58
Expert Reply
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Question Stats:
64% (00:52) correct
35% (01:02) wrong based on 31 sessions
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Three slices of pizza and a salad cost $6.45. Six slices of the same pizza and an identical salad cost $10.95. What is the cost of one slice of the pizza?
13%
$1.50
$1.95
$8.70
$4.50
$12.80
Kudos for right answer and explanation
Re: Three slices of pizza and a salad cost $6.45. Six slices of
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24 Jan 2018, 03:13
24 Jan 2018, 03:13
1
3x+y=6.45
6x+y=10.95
Solve x and y
Therefore Single Pizza cost: 1.50
6x+y=10.95
Solve x and y
Therefore Single Pizza cost: 1.50
Re: Three slices of pizza and a salad cost $6.45. Six slices of
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25 Jan 2018, 02:20
25 Jan 2018, 02:20
1
If you're presented with two cost functions (or any other function) which only differ in the factor of one variable you can easily see that the difference between the two equations, i.e. 10.95$ - 6.45$ = 4.5$, must equal the difference of the variable factor:
4.5$ difference must equal the absolute value of difference of pizza slices (3*P - 6*P = |3|*P).
Plugging in gives: 4.5$ = 3*P and solving: P = 1.5$, answer A
4.5$ difference must equal the absolute value of difference of pizza slices (3*P - 6*P = |3|*P).
Plugging in gives: 4.5$ = 3*P and solving: P = 1.5$, answer A
