1 is D
2 is A
3. is B
4. is D
5. is C
Answer:
250
Step-by-step explanation:
Number of labourers * Number of days worked = Total number of working days
Total number of working days to construct a 4km long road: 
Total mumber of working days to construct a 8km long road: 
Labourers: 20000 ÷ 80 = 250.
250 labourers are required.
-7 to make 4 so -4x=4 x=-1
The answer is x=-1
Hope this helps:)