Question 989994
.
t=number of therms used; B=gas bill
.
$22+$1.20t=B
$1.20t=B-$22
t=(B-$22)/$1.20
t=($78.40-$22)/$1.20
t=$56.40/$1.20
t=47
.
ANSWER: The company used 47 therms.