Question 12 Billy has twice as many marbles as Charlie. All has twice as many marbles as Billy. All has 6b more marbles than Charlie.
Charlie
Billy
Ali
3 units = _
1 unit = _+ 3 = _
All has _ marbles (in terms of b)
All, Billy and Charlie have _ marbles altogether (in terms of b)
Number of marbles Charlie has when b = 7 is _
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