Set up and solve equations for each of the following business situations.
A regular lightbulb uses 20 watts less than twice the power of an energysaver lightbulb. If the regular bulb uses 170 watts, how much does the energysaver bulb use?
To calculate: The power of energy saver bulbs, if the power used by a regular light bulb is
Given Information:
The power used by a regular light bulb is
Formula used:
To solve the equation and prove the solution, follow the steps as mentioned below.
Step
Step2: List the known and the unknows from the problem.
Step3: Write the equation with the help of following table of key word,
Equal Sign 
Addition 
Subtraction 
Multiplication 
Division 
Parentheses 
Is 
And 
Less 
of 
Divide 
Times the quantity of 
Are 
Added to 
Less than 
Multiply 
Divided by 

Was 
Totals 
Smaller than 
Times 
Divided into 

Equals 
The sum of 
Minus 
Product of 
Quotient of 

Gives 
Plus 
Difference 
Multiplied by 
Ratio of 

Giving 
More than 
Decreased by 
Twice 

Leaves 
Larger than 
Reduced by 
Double 

Results in 
Increased by 
Take away 
Triple 

Produces 
Greater than 
Loss of 
At 

yields 
exceeds 
Fewer than 
@ 
Step4: Solve the equation by rearrange the unknown values to the left side and known values to right side of the equal sign.
Step5: Prove the solution by substituting the value obtained from step 4 in the equation formed in step 4 then check the left and right of the equation if, they are equal then the answer is correct.
Calculation:
Suppose that X be power used by energy saver bulbs.
Underline the keyword by using the table of key word.
Consider the power used by a regular light bulb is
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