A medium sized apple has 70 cal. This is 10 cal less than a 1/4 of the calories in an old Westie chocolate bar. We need to find out how many calories are in a chocolate bar.

320 calories

Step-by-step explanation:

if a fourth of the chocolate bar is 10 more calories than 70 then it is 80 calories per fourth, 80 times 4 will give you 320. that means the candy bar contains 320 calories in total.

step-by-step explanation: s