If he uses 3/5 lb of clay to make 1 bowl, then we need to find how many 3/5 there are in 10 to find out how many bowls he can make...
10 ÷ 3/5 =
to divide fractions, multiply the reciprocal.
10/1 × 5/3 = 50/3
50/3 reduces to 16 2/3
Since you can't make 2/3 of a bowl, 10lb of clay will yield 16 bowls.