Question

Some number minus -15 is equal to the product of the number and 9

Answer 1

15/8

Explanation:

Let's assume that the number is 'n'. Provided that number 'n' minus -15 is equal to the product of the number 'n' and 9. Simply jot down the above statement in mathematical form:

`\implies\:\sf{\red{n \: - \: ( - 15) \: = \: n \: * \: 9}}`

Now, simply solve the above equation.

`\implies\:\sf{n \: + \: 15 \: = \: 9n}`

Take the like terms on one sides.

`\implies\:\sf{9n \: - \: n \: = \: 15}`

Do the rest calculations.

`\implies\:\sf{8n \: = \: 15}`

`\implies\:\sf{\red{n \: = \: (15)/(8)}}`

Hence, the required value of n is 15/8.

Answer 2

x = 15/8

Explanation:

Let x = unknown number

Given:

some number minus -15 is equal to the product of the number and 9

⇒ x - -15 = x · 9

⇒ x + 15 = 9x

⇒ 15 = 9x - x

⇒ 15 = 8x

⇒ x = 15/8