1 answer
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starting with x pancakes,
strawberry: 2/9 x
chocolate: 1/3 x
vanilla: 4/9 x
sold: 5/6 * 2/9 = 5/27 x strawberry
vanilla: 10/27 x
chocolate: 1/9 x
total sold: 2/3 x
1/3 x = 162, so
x = 3*162 = 486 pancakes at first