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DanielleElmas [232]
3 years ago
9

4. Seven times the difference of a number k and five is twenty-onel

Mathematics
1 answer:
laila [671]3 years ago
4 0

Answer:

k = 8

Step-by-step explanation:

7(k - 5) = 21

k - 5 = 3

k = 8

Hope this helps!

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Answer:

Number of children, x= 400

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Step-by-step explanation:

Let the number of children be x

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Given : Total number of people,  x + y = 500  --------(1)

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(1) => y = 500 - x

Substitute y in (2) : 5x + 10(500 - x) = 3000

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                                 -5x = -2000

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Substitute x in (1) : 400 + y = 500

                                      y = 500 - 400

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