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tresset_1 [31]
3 years ago
10

You are buying decorations for a birthday party. Six rolls of crepe paper and 20 balloons cost $11.90. After you start decoratin

g, you need more supplies. You buy 2 more rolls of crepe paper and 15 more balloons for $6.05.
Mathematics
1 answer:
olga2289 [7]3 years ago
6 0

Answer: $1.15

Step-by-step explanation:

The question is How much did each roll of crepe paper cost?

Let the cost of crepe paper be x

Let the cost of balloons be y.

Six rolls of crepe paper and 20 balloons cost $11.90. This will be:

6x + 20y = 11.90 ......... i

2 more rolls of crepe paper and 15 more balloons for $6.05. This will be:

2x + 15y = 6.05 ......... ii

6x + 20y = 11.90 ......... i

2x + 15y = 6.05 ......... ii

Multiply equation i by 15

Multiply equation ii by 20

90x + 300y = 178.50 ........ iii

40x + 300y = 121 ........ iv

Subtract iv from iii

50x = 57.50

x = 57.50/50

x = 1.15

Therefore, a crepe paper cost $1.15

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24 students have turned in their permission slips so far. This is 80% in the class. How many students are in the class.
evablogger [386]

Answer:

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Step-by-step explanation:

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Please help me on this one ​
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Answer:

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Step-by-step explanation:

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A farmer is able to prepare 1/2 are of soil in 3 days. How long will it take him to prepare 2 1/4 acres of soil?
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Answer:

x = 13 1/2 days

Step-by-step explanation:

1/2 acre              2 1/4 acre

------------ = -------------------------

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egoroff_w [7]
-1/2 is the answer :)
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