When solving for this, you can derive the equations
x=5y and x+6= 3(y+6)
x= mother and y= Daughter
Solve the equations by substituting the first equation into the places of x in the second equation to get the value of x. Next, pug in the value of x and solve for y.
Use similar volume to calculate which is the (ratio of edges)^3 = (ration of volume) so just put the numbers in, let the volume of smaller pyramid be y. (3/4)^3 = y/320 27/64 = y/320 y=135in3
