Roses for Girl friend

One day a Boys Girlfriend was approaching. The boy was not in the city so he ordered 24 red roses for her girlfriend and called her up; Dear I have sent you as many roses as of your Age is going to be on the birthday! While delivering florist thought; Its a good customer for me today; Lets add 10 More! So he gave 34 instead of 24! And till today the Boy didnt understand why she broked!