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3) The make up of the marbles in terms of proportions is:

Y Y Y Y Y Y Y Y G B B B

84 more Yellow marbles than Green marbles, so it means

7 Y = 84 
So Y = 12

Hence total marbles in box = 12 * 12 = 144 #

4) S S S S S S S S S S S S J J J J J J _ _ 

where S is what was sold and J is what she gave to Jane.

So 2_ = 154
=> _ = 77

So she must have made 77 * 20 = 1540 tarts #

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