9) a café puts 2 slices of ham into every ham sandwich. a slice of ham weighs 10g. if the café sells 500 sandwiches, how many 1.5kg packs of ham should they buy?

2 ham slices : 1 ham sw.
10 g/slice = 20 g/ham sw.
500 ham sw. must use 10000 g = 10 kg. ham slice
10/1.5 = 6.6666
so they should buy 7 packs

The area of the orange square rug (including the yellow square) is 10*10=100 square inchesthe area of the orange square rug without the yellow square is 100 minus the area of the yellow squarethe area of the yellow square is x*x=x2therefore the area is (100-x2) square inches