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2 years ago

When I add a number to another number four times as big, the result is 30. find the first number

Mathematics

2 answers:

Leno4ka [110]2 years ago

4 0

Let's assume the number is N

According to the question, 

when I add a number to another number four times as big, the result is 30.

$x+4x=30\\\\5x=30\\\\x=\dfrac{30}{5}\\\\x=\frak{6}$

Alex73 [517]2 years ago

3 0

Answer:

x = 6

Step-by-step explanation:

Let x = first number

x+4x = 30

5x = 30

Divide by 5

5x/5 =30/5

x = 6

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Step-by-step explanation:

Previous concepts

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Where (nCx) means combinatory and it's given by this formula:

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