Question

If 21 more than 3 times a number is -15, what is the number?

Answer 1

Answer:

Twenty-one more than three times a number is twelve less than the sum of the number and 5. Find the number.

.

Let x = "the number"

then

3x + 21 = (x+5) - 12

3x + 21 = x - 7

2x + 21 = -7

2x = -28

x = -14

.

The number is -14

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Answer 2

Solution:-

Assumption:-

Let the unknown number is x

To Find:-

The unknown number means the value of x .

By the Problem:-

$3x + 21 = - 15 \\ = > 3x = - 21 - 15 \\ = > 3x = - 36 \\ = > x = \frac{ - 36}{3} \\ = > - 12$

Answer:-

The unknown number is -12.