the answer is 6
Explanation:
Set up a ratio
The percentage of candy bars left is
100
−
70
=
30
Let 30% be the partial percentage.
Let 100% be the total percentage.
Let x be the partial number of candy bars.
Let 20 be the total number of candy bars.
30
100
=
x
20
Multiply both sides by 20
30
×
20
100
=
x
×
20
20
This leaves
600
100
=
x
Dividing by 100 gives
6
=
x
.
There are 6 candy bars left