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(a) If each unit is u, backpack is 4u, sling bag is 2u, so 4u/2u = 2
Backpack is 2 times of sling bags.
(b) let the unknown gym bags be p. Total of the other 3 bags type = 2 + 4 +3 = 9
p / (9+p) = 1/4
4p = 9+p => 3p =9 => p = 3
Hence 3 boxes must be shaded for gym bags.