How many #1/3# pieces can be made from #2# pizzas, we know it is #6# and it is arrived by dividing #2# by #1/3# or multiplying by its reciprocal #3/1#.
Hence to find how many #3/10# pieces can be made from #12/15# pizza, we have to divide #12/15# by #3/10# or multiplying by its reciprocal #10/3#, i.e.
#(4cancel(12))/(3cancel(15))xx(2cancel(10))/(cancel3)=8/3=2 2/3#
What does that mean? This means that while #2# three-tenths pieces can be made, #2/3# of #3/10# i.e. #2/cancel3xxcancel3/10=2/10=1/5# or one fifth of pizza will be left out.