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Find the fraction of boys in the class.

Mathematics

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Answer

D

Step-by-step solution

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Here are the solutions to the questions:

15. There are 132 learners in a class. If 23\frac{2}{3} of the learners are girls, how many boys are in the class?

  1. Find the fraction of boys in the class.

    If 23\frac{2}{3} of the learners are girls, then the remaining fraction are boys.

    Fraction of boys=1−23=33−23=13\text{Fraction of boys} = 1 - \frac{2}{3} = \frac{3}{3} - \frac{2}{3} = \frac{1}{3}
  2. Calculate the number of boys.

    Multiply the total number of learners by the fraction of boys.

    Number of boys=13×132\text{Number of boys} = \frac{1}{3} \times 132 Number of boys=1323\text{Number of boys} = \frac{132}{3} Number of boys=44\text{Number of boys} = 44

    The correct option is D.
    D. 44

    16. In a school, 40% of the learners like French. If there are 120 learners in the school, find the number of learners who like French.

  3. Convert the percentage to a decimal or fraction.

    40%=40100=0.440\% = \frac{40}{100} = 0.4
  4. Calculate the number of learners who like French.

    Multiply the total number of learners by the percentage who like French.

    Number of learners who like French=0.4×120\text{Number of learners who like French} = 0.4 \times 120 Number of learners who like French=48\text{Number of learners who like French} = 48

    The correct option is C.
    C. 48

    17. If 50kg of rice cost 500 cedis. What is the cost per kilogram of rice?

  5. Divide the total cost by the total quantity to find the cost per kilogram.

    Cost per kilogram=Total costTotal quantity\text{Cost per kilogram} = \frac{\text{Total cost}}{\text{Total quantity}} Cost per kilogram=500 cedis50 kg\text{Cost per kilogram} = \frac{500 \text{ cedis}}{50 \text{ kg}} Cost per kilogram=10 cedis/kg\text{Cost per kilogram} = 10 \text{ cedis/kg}

    The correct option is B.
    B. Gh¢10

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