answer 18.19.20
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18.)Volume of one match box =4×2.5×1.5cm3=15cm³
Volume of 144 matchboxes =15×144cm3 or volume of one packet =2160cm³
Length ofcarton (l)=1.5 m =150 cm
Breadth (b)=84 cm.
and height (h)=60 cm.
∴ Volume of one carton =l×b×h
=150×84×60cm³
=756000cm³
∴ No. of packetes =756000÷2160
=350
19.)Area of field =5 hectare
=50000 m² [Since 1 hectare=1000 m²]
Rainfall =5 cm=0.05 m [Since, 1 cm=1100]
∴ Volume of water of rainfall=Area of field × height of rainfall water
=50000×0.05m³=2500 m³
20.)thickness of sheet = volume/area
=0.8/10000
=80/10000
=0.008mm
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Thickness of the steet =volume/area
=0.8/10000
=80/10000
= 0.008mm
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