Andrea sold 16 x 2 = <<16*2=32>>32 tickets.

Half the number of tickets Jude sold is 16/2 = <<16/2=8>>8.

So, Sandra sold 8 + 4 = <<8+4=12>>12 tickets.

Thus, Andrea, Jude, and Sandra sold a total of 32 + 16 + 12 = <<32+16+12=60>>60 tickets.

Therefore, 100 - 60 = <<100-60=40>>40 tickets need to be sold.

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
There are one hundred tickets to be sold for a volleyball game. Andrea sold twice as many tickets as Jude while Sandra sold 4 more than half the number of tickets Jude sold. If Jude sold 16 tickets, how many tickets need to be sold?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
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user
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There are one hundred tickets to be sold for a volleyball game. Andrea sold twice as many tickets as Jude while Sandra sold 4 more than half the number of tickets Jude sold. If Jude sold 16 tickets, how many tickets need to be sold?
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