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Lin sold 4 more shirts than Greg. Fran sold 3 times as many shirts as Lin. In total, the three sold 51 shirts. Which represents the number of shirts Greg sold?

Let x be the total number that Greg sold

And x + 4 the number that Lin sold

And 3(x + 4) the number that Fran sold

So we have

x + x + 4  + 3(x + 4) = 51   simplify

5x + 16  = 51      subtract 16 from both sides

5x = 35     divide both sides by 5

x = 7 = the number Greg sold