15p^2-11p-14 is the product
You can use a calculator for this.
Divide 93.6/0.36 = 260
So the number is 260.
He needs 6 litres of the 20% and 2 litres of the 60% a simple trial and error method will do in this type of equation
V = π × r² × h
The radius of the base is equal to half of its diameter. So, we have:
V = 3,14 × 6,5² × 11
V ≈ 1459.3 cm³