a store is selling apples on sale for 21.00 for 6 pounds if apples weights 5 ib
how many apples can you buy for 168.00
since no apple in my experience weighs 5 lbs, I'll assume you meant 0.5 lb per apple. In that case,
$168 * 6lb/$21 * 1apple/0.5lb = (168*6)/(21*0.5) = 96 apples