An old rectangular tank with length 0.3 m could hold 154 l of water. a new similar tank has a length of 1.5 m. what is the capacity of the new tank?

The length of the new tank is 5 times bigger than the old one, so 154×5=770. As a result, the capacity of the new tank is 770L. Hope it help!

You can use a proportion for this problem.  First, always make sure that the units are the same in both scenarios.  Then you can set up the proportion: (given m of old tank)/(given L of old tank)=(given m of new tank)/x   Let x represent the L in the new tank.  Then cross multiply to solve the proportion.