Answer:
47 therms
Explanation:
A $78.40 gas bill has a $22 monthly connection fee and charges of $1.20 per therm. You want to know the number of therms being charged.
Therms
Let t represent the number of therms at $1.20 each. The gas bill chargest are ...
1.20t +22 = 78.40
Solution
Subtracting 22 gives ...
1.20t = 56.40
Dividing by 1.20 tells the number of therms:
t = 56.40/1.20 = 47
The company used 47 therms.