3 years ago

3 times an unknown number is 21. Find the unknown number. The unknow number is

Mathematics

2 answers:

Vinvika [58]3 years ago

7 0

Answer:

The answer is 7

Step-by-step explanation:

Because 7 times 3 will give you 21, just divide 21 by 3.

Elenna [48]3 years ago

5 0

Answer:

The answer is 7

Step-by-step explanation:

7+7+7=21

3×7=21

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Answer:

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Step-by-step explanation:

$3x-y=12$

$-y=12-3x$

$y=3x-12$ -------------------------(equation 1)

Now,

$\frac{8x}{2y} =\frac{8x}{2(3x-12)}$ ---------(from equation 1)

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$=\frac{4x}{3x-12}$

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3 years ago

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Answer:

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Step-by-step explanation:

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