Homework Help: math

Posted by Jas on Wednesday, April 2, 2008 at 8:05pm.

The average, that is, the arithmetic mean, age of a group of
doctors and lawyers is 40. If the average age of the doctors is 35
and the average age of the lawyers is 50, then what is the ratio of
the number of doctors to the number of lawyers?

math - Reiny, Wednesday, April 2, 2008 at 10:00pm
let the number of doctors be d
let the number of lawyers be l

total of ages of doctors = 35d
total of ages of lawyers = 50l

total of both groups = 35d+50l
but this is also equal to 40(d+l)

so 40(d+l) = 35d + 50l
40d + 40l = 35d + 50l
5d = 10l
d/l = 10/2 = 2:1
math - Laurel, Monday, April 7, 2008 at 8:22pm
What is

1 +1000546466
math - Laurel, Monday, April 7, 2008 at 8:23pm
What is

1-1865=
- math - Laurel, Monday, April 7, 2008 at 8:24pm
  1-32
- math - Laurel, Monday, April 7, 2008 at 8:25pm
  1+2=
- math - Laurel, Monday, April 7, 2008 at 8:33pm
  1+2=

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