How many more workers are needed to finish in fewer days

This type of question, asked 3 times: 19 Jul 2023 S4, 24 Jul 2023 S4, 25 Jul 2023 S4. All 3 questions below, oldest first.

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Question 1
19 Jul 2023 S4
69 $12 men can complete a work in 10 days. How many more men are required to complete the work in 6 days?$
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Question 2
24 Jul 2023 S4
51 $6 labourers can finish a work in 16 days. 10 labourers are available, but the work is to be finished by 8 days. How many more labourers are to be called to finish the work in time?$
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Question 3
25 Jul 2023 S4
54 $4 men, working together, can finish a work in 18 days. How many more men are required to finish the same work in 12 days?$
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Question 1