Harry the hungry hippo is munching on the lily pads in his pond. when he arrived at the pond,
there were 20 lily pads, but he is eating 4 lily pads an hour. heinrick the hungrier hippo found a better
pond with 29 lily pads! he eats 7 lily pads every hour. homework
if harry and heinrick start eating at the same time, when
will their ponds have the same number of lily pads
remaining?

b. how many lily pads will be left in each pond at that time?