Birthday Party

This task is about working out word problems.
 
Ruby had a birthday party.
She invited some friends.
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Question 1Change answer

a)  There were 5 bottles of orange drink at the party. 
     Ruby and her friends drank 3 bottles of orange drink.
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     How many bottles of orange drink were left over?

Question 1Change answer

b)  There were 8 children at Ruby's party.
     There were 5 girls.
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     How many boys were at Ruby's party? 

Question 1Change answer

c)  There were 17 balloons at the party.
     Ruby gave 4 balloons to her friends.
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     How many balloons did she have left?

Question 1Change answer

d)   Ruby's dad cut the cake into 14 pieces.
      Ruby and her friends ate 9 pieces of cake.
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     How many pieces of cake were left?