SOLUTION: If one pound can feed either 5 chickens or 2 pigs, then ten pounds of grain can feed 20 chickens and how many pigs?
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If one pound can feed either 5 chickens or 2 pigs, then ten pounds of grain can feed 20 chickens and how many pigs?
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This phrase ". . . one pound can feed either 5 chickens or 2 pigs" means that
1 chicken eats = 0.2 pound of grain, or
1 pig eats = 0.5 pound of grain.
Then 20 chickens will eat 0.2*20 = 4 pounds of grain, and still 10 - 4 = 6 pounds of grain will remain.
It is enough to feed = 12 pigs.
Answer. ". . . and how many pigs?" - 12 pigs.
