Question

http://prntscr.com/6lcjrp

Answer 1

hmmm

Answer 2

actually... should be what remained....so

Answer 3

originaly there were 60

so 1/3 of that was sold or 1/3 * 60

then what remained? well, if 1/3 of 60 was sold, then 2/3 of 60 remained

the next day it sold, 3/5 of that remaining amount, or 2/3 of 60

thus \(\bf 60-\left( \cfrac{1}{3}\cdot 60 \right)-\left[ \cfrac{3}{5} \left( {\color{brown}{ \cfrac{2}{3} }}\cdot 60 \right)\right]
\)

Answer 4

bear in mind that 3/3 = 1 or 1 whole

and that 1/3 + 2/3 = 3/3 = 1 or the original whole amount