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Using only basic math:
$0.45 <-- cost of 1 apple
x 5 <-- number of apples
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$2.25 <-- cost of 5 apples
$4.67 <-- cost of 5 apples and 1 pear
-$2.25 <-- cost of 5 apples
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$2.42 <-- cost of 1 pear
Using algebra:
Five apples and a pear cost $4.67.
| | | | | |
5 A + P = 4.67
5A + P = 4.67
If an apple cost $0.45,
| | |
A = 0.45
A = 0.45
how much does a pear cost?
Plug (0.45) for A into
5A + P = 4.67
5(0.45) + P = 4.67
Multiply the 5 by the 0.45 and get 2.25 and
substitute that for 5(0.45)
2.25 + P = 4.67
Subtract 2.25 from both sides:
2.25 + P = 4.67
-2.25 -2.25
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P = 2.42
Answer: $2.42
Edwin
