aig math
posted by lidia .
the sum of 2 numbers is 77. one number is 2 1/2 times as big as the other number.find the difference between the 2 addends.please show how you got your answer.
my answer is 72.6, am i right if not please tell me why and how.

the numbers are n and 5/2 n
add them up to get 77:
n + 5/2 n = 77
7/2 n = 77
n = 22
the numbers are 22 and 55 
Let the two numbers be x and 2.5x. Their difference is 1.5x
3.5x = 77
x = 22
2.5x = 55
The difference is 1.5x = 33
Your answer is incorrect. 
one number form 75 is 100