Problema Solution
During a certain week the number of lunches served in a shool canteen were: Monday 213, Tuesday 243, Wednesday 237 and Thursday 239. Find the average number of meals served daily over the four days. If the daily average for the week was 225, how many meals were served on Friday?
Answer provided by our tutors
the average number of meals served daily over the four days is
(213 + 243 + 237 + 239)/4 = 233 lunches
the average number of meals served daily over the four days is 233.
let x = the number of lunches served on Friday
the daily average for the week was 225
(213 + 243 + 237 + 239 + x)/5 = 225
by solving we find
x = 193 lunches
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there were 193 lunches served on Friday.