question: 3 trees each had 7 blue birds in them. 2 different trees each had 4 blue birds. 1 final tree had 3 blue birds. How many blue birds were in the trees in total?
answer: The first 3 trees had 7*3=<<7*3=21>>21 blue birds.
  The second 2 trees had 4*2=<<4*2=8>>8 blue birds.
  There were 21+8+3=<<21+8+3=32>>32 blue birds in total.
  #### 32