There is a total of 25 horses and hens on a farm, and in total they have 70 legs. write an equation and solve it to find how many there are of each animal.
You should know that there are 2 legs for every hen and 4 legs for every horse. You will have an equation for the number of animals and an equation for the number of legs.
Start by identifying your symbols: let "a" mean the number of horses and "b" mean the number of hens. If you knew a and b, how would you find the total number of animals? If you knew a and b how would you find the total number of legs?