Homework Help: maths urgent

Posted by joel on Thursday, September 22, 2011 at 12:09pm.

The average mass of half the number of crabs in a basket is 350g, the average mass of the remaining crabs is 300g. If the total mass iof the crabs in the basket is 13kg, how many crabs are there in the basket?

maths urgent - oi, Thursday, September 22, 2011 at 12:54pm
350+300=650g
13kg=13000g
13000/650
=20crabs
maths urgent - Reiny, Thursday, September 22, 2011 at 1:08pm
let number of crabs be x
mass of 1/2 the craps
= 350(x/2) =175x
mass of remaining ones = 300(x/2) = 150x

175x + 150 = 13000
325x = 13000
x = 40

there were 40 crabs

check:
half of 40 = 20
so 20(350) + 20(300) = 13000

oi's answer makes no sense and does not check out.

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