Problema Solution
Andy and Bethany have a rectangular array of numbers with 40 rows and 75 columns. Andy adds the numbers in each row. The average of his 40 sums is A. Bethany add the numbers in each column. The average of her 75 sums is B. What is the value of A/B?
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Answer provided by our tutors
If you add the numbers ina table, either way yu add, that is columns first or rows first you end up with the same sum. Let this sum be X.
So A=X/40
B= X/75
A/B = (X/40)/(X/75) = (X/40)*(75/X) = 75/40 = 15/8