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Vilka [71]
3 years ago
10

Jon finds a box of 350 postcards. He selects a random sample of 75 postcards and finds that 27 already have a stamp on them. Pre

dict the total number of postcards in the box with stamps on them.
Mathematics
1 answer:
DiKsa [7]3 years ago
5 0

Answer:

126

Step-by-step explanation:

Let the total number of postcard with stamp on it =x

Out of 350 postcards, x has stamp on it.

Out of 75 postcards, 27 has stamp on it.

Expressing these as a ratio:

350:x=75:27

350/x=75/27

Cross multiply

75x=350*27

x=(350*27)/75

x= 126

Therefore, the the total number of postcards in the box with stamps on them is 126.

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C. (7, 0)
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3 years ago
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Vlad [161]

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The shorter tree is 5 ft shorter, but is growing 1 ft/year faster. It will make up the difference of 5 ft in (5 ft)/(1 ft/year) = 5 years.

8 0
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Answer:

The amount of peanuts to use is 5 pounds and that of cashews is 30 pounds.

Step-by-step explanation:

Let the amount of peanut to use to be x

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Form equations to compare amounts for individual foods and the mixture

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So the pounds to be used for peanuts is 5 pounds

The pounds to be used for cashews will be 35-x= 35-5=30 pounds

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