-) Twenty 5-kilogram boxes are needed to pack 100 kilograms of mangoes.
If the seller decides to pack them in 4-kilogram boxes instead, how many of
these boxes does he need?
-) Berto opens six water faucets to fill the tank with water in 120 minutes. How
many water faucets does he need to open to fill the same tank with water in 90
minutes?​