# Maths Problems solved

Feb 3rd, 2012
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16. 4.7/(9.4-3.5) = 0.7966 17. (2.3/1.8)^2*1.07 = 1.747 14. 3.8^2 - sqrt(75) = 5.78 After his holiday Jamie changes 160 dollars back into pounds. The exchange rate is 1 pound = 1.70 dollars.

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16. 4.7/(9.4-3.5) = 0.796617. (2.3/1.8)^2*1.07 = 1.74714. 3.8^2 - sqrt(75) = 5.78To one significant digit: 520. (8.7*12.3)/(9.5-5.73) = 28.38To one significant figure: 3027. (4.6+3.85)/(3.2^2 - 6.51) = 2.27To one significant figure: 2After his holiday Jamie changes 160 dollars back into pounds. The exchange rate is 1 pound = 1.70 dollars.b) 160/1.70 = 94.12 lbsCoin made from copper and nickel. Ratio of copper: nickel is 84:16 or 21:4C8. 1x + 4x = 355x = 35x = 7She needs 7 g of tin.b. 1x = 18, therefore 4x = 72Sven made 18 + 72 g of alloy = 90 gC25. If Mike buys 3 files for 5.40, then you set up a ratio:3x = 7*5.403x = 37.8x = 12.607 files cost 12.60C19. flour: 200 g150 g almonds225 g brown sugar150 g butter10 pearsC26. 300 g flour3 eggs75 g currants150 mL milkC12. History: 42/50 = 0.84 = 84%Geography: 48/60 = 0.80 = 80% He got the higher grade on the history test.Sport 4 all trainers:2(5) + 20(4.50) = 100Edexcel Sports:65-(1/5)*65 = 65 - 13 = 5252*2 = 104Complete the table:a) 35%b) 8%c) 30% as a fraction is 30/100 or 3/10d) 9% as a decimal is 0.09e) 2000*0.14 = 280C12. 1/10 as a decimal is 0.11/10 as a percentage is 10%He has 3/10 sweets left for himself.20*(3/10) = 6 candies9/18 of the students went to the chemistry revision.36*(9/18) = 18 studentsC3. 11/29 of the students are boysC5. 200 * (3/5) = 120 tissuesC8.3/4Write 3/10 as a decimal =

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