Please help me answer a math question

Question

A dolphin calf swims at a depth of -7/4 feet from the sea surface. An adult dolphin swims at a depth 5/3 times the depth at wich the calf swims.what is the depth in feet of the adult dolphin from tge sea surface?

Answer 1

Hi Ali,

 

The dolphin calf swims at a depth 4/7 feet from the surface of the sea.

 

If the adult dolphin swims at a depth 5/3 of the calf, we have

 

(4/7)(5/3) = 20/21

 

The adult dolphin swims at a depth 20/21 feet below the surface.

Answer 2

Ali,

 

Just replace 4/7 with 7/4 in Marlene's solution and get (7/4)(5/3) feet = 35/12 feet.