[Math4u] maths problem

Dear all,
I have recently joined this group and i have a little bit english
problems as well, bus any way now i want to write a question that
involves math, and i have been asked this question when i wanted to do
AS math in a college:

In a big room we have a number of cows and chickens, a person get
inside the room and count all the cows and chickens together and the
total number of them is 30,
then he counts all the legs in the floor of that room, and he notice
that there are 98 legs together, now the question is how many cows and
chicken are there in the room;

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