Question 1050139
So the large cylindrical can has:
Diameter 22 means the radius is 22/2= 11
Height 28
Area of the base: 
A = Pi*r^2*height
A = Pi*11^2*28
A = 380.13*28 = 10,643.72
And you want to fill: small cans with a diameter of  15 = radius 15/2 = 7.5 to a depth of 6.
Follow the formula above:
A = Pi*7.5^2*6 = 1,060.29
Let's put it together, you can fill:
10,643.72/1,060.29 = 10 cans (comes out to 10.038 due to rounding of decimals, it's 10 cans).