13. A trench 5 m by 16 m and 0.75 m deep is dug. The earth taken out is spread uniformly to form a layer 12.5 cm deep and 4 m wide. What is the length of the layer?
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Volume of earth dug out=5m*16m*0.75m
Let the length of the layer be x
According to the problem, volume of earth dug out= volume of later spread out uniformly
=>5*16*0.75=x*4*12.5/100
=>x=5*16*0.75*100/(4*12.5)=120
Answer: the length of the layer is 120m
Let the length of the layer be x
According to the problem, volume of earth dug out= volume of later spread out uniformly
=>5*16*0.75=x*4*12.5/100
=>x=5*16*0.75*100/(4*12.5)=120
Answer: the length of the layer is 120m
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