Test on correct use of Numbers

Which of the following is incorrect use of numbers?
At the meeting, nine people spoke against the proposal.
Twenty messages were transmitted.
Forty one messages failed.
Which of the following is the correct use of mixed numbers?
The engineer worked 7½ hours.
The engineer worked 7.5 hours.
The engineer worked 7 and a half hours.
Which of the following is the correct use of adjacent numbers?
20 sixteen meter poles are required.
Twenty, 16 meter poles are required.
Twenty 16 meter poles are required
20, 16 meter poles are required.
Which of the following is the correct use of percentage?
20 percent of disk space is consumed.
Twenty percent of disk space is consumed.
20 % of disk space is consumed.
20% of disk space is consumed.
Which of the following is the correct use of number in series?
The technician requires 12 connectors, 5 SAS tape drives, and 11 power cords.
The technician requires 12 connectors, five SAS tape drives, and 11 power cords.
Both
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