Explanation for Question 8 From the Math (No Calc) Section on the 2019 April Sat
For number eight, it gives us a formula for volume in terms of mass 2 and density. And we are looking for a formula for density in term of 3 volume and mass. So basically what we're trying to do here is get D 4 alone on one side. So the first step would be to multiply D 5 on both sides. That'll get rid of D on that side and like gives 6 us DB equals M and then now to get DHEA low, 7 and you can divide both sides by B. So that B will cancel out 8 and leave you with D equals M over B, 9 which is B.