Question

12 subtracted from nine times a number is equal to the sum of seven times the number and 4. What is the number?

• A. 9
• B. 7
• C. 8
• D. 12

Answer 1

The correct option is C 8

Let the number be $x$.
12 subtracted from nine times the number is $9x-12$.
The sum of seven times the number and 4 is $7x+4$.
According to the given data,
$9x-12=7x+4$
$\Rightarrow 9x-7x=12+4$
$\Rightarrow 2x=16$
$\Rightarrow x=\frac{16}{2}$
$\therefore x=8$
Hence, the number is 8.