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7. Change the following statements using expressions into statements in ordinary language:B) A notebook costs p. A book costs 3p.The cost of rice per kg is p. The cost of oil per litre is 5p.The speed of a truck is u km per hour. The speed of a bus is (v + 10) km per hour.(iv) Chan's box contains 8 times the marbles he puts on the table.(u) The total number of students in the school is 20 times that of our class.(vi) Anuj is x years old. His uncle is 4x years old and his aunt is (4x - 3) years old.(vii) In arrangement of dots, there are r rows. Each row contains 5 dots. |
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Answer» Given: L=5 m, B=4 m, H=3m ⇒AREA to be WHITE-washed = Area of CUBOID − Area of base. =2lh+2bh+2lb−lb =2lh+2bh+lb =[2×5×3+2×4×3+5×4]m2 =74m2 Cost of white washing per m2 area = Rs.7.50 Cost of white washing 74m2 area=74×7.50 = Rs.555 Given: L=5 m, B=4 m, H=3m ⇒Area to be white-washed = Area of cuboid − Area of base. =2lh+2bh+2lb−lb =2lh+2bh+lb =[2×5×3+2×4×3+5×4]m2 =74m2 Cost of white washing per m2 area = Rs.7.50 Cost of white washing 74m2 area=74×7.50 = Rs.555 Given: L=5 m, B=4 m, H=3m ⇒Area to be white-washed = Area of cuboid − Area of base. =2lh+2bh+2lb−lb =2lh+2bh+lb =[2×5×3+2×4×3+5×4]m2 =74m2 Cost of white washing per m2 area = Rs.7.50 Cost of white washing 74m2 area=74×7.50 = Rs.555 Given: L=5 m, B=4 m, H=3m ⇒Area to be white-washed = Area of cuboid − Area of base. =2lh+2bh+2lb−lb =2lh+2bh+lb =[2×5×3+2×4×3+5×4]m2 =74m2 Cost of white washing per m2 area = Rs.7.50 Cost of white washing 74m2 area=74×7.50 = Rs.555 Given: L=5 m, B=4 m, H=3m ⇒Area to be white-washed = Area of cuboid − Area of base. =2lh+2bh+2lb−lb =2lh+2bh+lb =[2×5×3+2×4×3+5×4]m2 =74m2 Cost of white washing per m2 area = Rs.7.50 Cost of white washing 74m2 area=74×7.50 = Rs.555 |
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