Mike received 3 oranges.
Matt received twice as many apples as Mike received oranges, so he got 3 * 2 = <<3*2=6>>6 apples.
Mark received 6 + 3 = <<6+3=9>>9 bananas.
So in total, all children received 3 + 6 + 9 = <<3+6+9=18>>18 fruits.
#### 18