Twenty less than ten times a certain number is 600. Find the number.

Let x represent the unknown number. Set up an equation.
10x −20 = 600
Solve the equation. Add 20 to both sides, then divide the resulting equation by 10.
10x −20 = 600
10x − 20 + 20 = −600 + 20
10x = 620
\(10x \div 10= 620 \div 10\)
\(x=62\)