“Em uma fazenda a soma entre o número vacas e de galinhas equivale a 72 e a diferença entre o número de vacas e o triplo do número de galinhas é -88.” Quantas galinhas há na fazenda?

There are 40 hens on the farm

Step-by-step explanation:

Here, we want to know the number of hens on the farm.

Let the number of cows be c and the number of hens be h

From the first statement in the question;

c + h = 72 •••••••••••••(i)

From the second statement ;

c - 3h = -88 •••••••••(ii)

We can then solve both equations simultaneously to get h;

That would be easier by subtracting equation ii from i

Thus, we have;

(c-c) + h-(-3h) = 72-(-88)

4h = 160

h = 160/4

h = 40

There are 40 hens on the farm

sites:

~dasgupta/mathbook/append17dec2k8.pdf