Answer:
320 calories
Explanation:
Given that the medium sized apple has 70 calories this 10 calories less than one-fourth of the calories in the old Westie chocolate bar, considering the later part of the sentence,
10 calories less than one-fourth of the calories in the old Westie chocolate bar can be expressed mathematically as
(1/4)x - 10 where x is the calories in the old Westie chocolate bar. As such, it means that
(1/4)x - 10 = 70
1/4)x = 80
x = 80 * 4
= 320 calories
a chocolate bar has 320 calories