proportion

The real variables $x, y, z$, and the real constants $p, q, r$ satisfy $\frac{x}{pq - r^2} = \frac{y}{qr - p^2} = \frac{z}{rp - q^2}$ Given that the denominators are non-zero, the...

The number of hens, ducks and goats in farm P are 65, 91 and 169, respectively. The total number of hens, ducks and goats in a nearby farm Q is 416. The ratio of hens:ducks:goats i...