Question

Shirley works at a diner. Each day for a week, she keeps track of the number of peoplewho order a cheeseburger. For Monday through Friday she obtains the following totals:83, 76,102, 94, and 128. If the 7-day average was 102 cheese burgers, how many wereordered on Saturday art Sunday combined?1. 2422. 2313. 7144. 204

Answer 1

Let x be the combined number of orders of cheeseburger on Saturday and Sunday.

Average = sum of all the orders from Moday to Sunday / no. of days

Let's substitute the given values in the problem to the formula for the average.

102 = ( 83 + 76 + 102 +94 + 128 +x) / 7

102 = (483 + x) / 7

102 ( 7) = 483 + x (cross multiplication, we multiply both sides of the eq. by 7)

714 = 483 + x

714 - 483 = x (transposing the constants to the left-hand side of the eq.)

231 = x

x= 231

Answer: The combined number of orders of cheeseburger on Saturday and Sunday IS 231.