The buns

Kate, Zofia and Peter Liked buns. Even today, their grandmother prepare their favorite meal. Katka eats 4 bunches, Žofia 3 and Petra eats 5 buns. Their grandmother said to them, "My inmate will you know how many buns I have been make today, if those you eaten were two-thirds of all?" Help the girls calculate how many buns grandmother make.

Correct result:

x =  18

Solution:

4+3+5 = 2/3 x

4+3+5 = 2/3•x

2x = 36

x = 18

Our simple equation calculator calculates it.

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