First of all, add 10 to 70. This is necessary because in the question, it states that 70 calories is 10 LESS than one-fourth of the calories in a Sugar Krunchy. Doing that will give you 80 calories, but that's only the first part. Since if also states that 80 calories is ONE-FOURTH of the calories in the Sugar Krunchy, you have to multiply 80 by 4.
Henceforth, your final answer should be 320 calories.