PLEASE

a) Old MacDonald had some horses, cows, and pigs on his farm. He had
69 water troughs for these animals to drink from. Horses drank only from
the horse troughs, exactly two horses for each trough. Cows drank from
cow troughs, exactly three cows per trough. And pigs drank from pig
troughs, exactly eight pigs per trough. Old MacDonald's farm has the same
number of horses, cows, and pigs. How many animals does Old
MacDonald have on his farm?