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scZoUnD [109]
3 years ago
15

Ivan bought 35 stamps. Some of these stamps cost $0.15 each, and the rest cost $0.40 each. If the total value of the stamps he b

ought is $7.25, determine the number of $0.15 stamps that Ivan bought.
Mathematics
1 answer:
3241004551 [841]3 years ago
6 0

Answer:

  27

Step-by-step explanation:

Let x represent the number of $0.15 stamps Ivan bought. Then the value of his stamps is ...

  0.15x +0.40(35-x) = 7.25

  -0.25x +14.00 = 7.25 . . . . . eliminate parentheses, collect terms

  -0.25x = -6.75 . . . . . . . . . . . subtract 14.00

  x = 27 . . . . . . . . . . . . . . . . . . divide by -0.25

Ivan bought 27 $0.15 stamps.

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An equation that models the proportional relationship between t and s.

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<h3>What is proportional relationship?</h3>

Relationships between two variables where their ratios are equal are known as proportional relationships. The fact that one variable is always a constant value multiplied by the other in a proportionate connection is another way to conceive of them. This parameter is referred to as the "constant of proportionality."

<h3>According to the given information :</h3>

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