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7 21,99 kg + 1,871 kg 40 Exa 2,109 6/80 £ 4. EXERCISE 6.8 1. a) 80% Convert the following percentages into common fractions: b) 12% b) 24 75 c) 55% Convert the following fractions into percentages: a) 100 33 3. c) 150 30 d) 94% d) 20 16 Which is a better achievement: winning 12 out of the last 20 soccer matches or 22 out of 40 soccer matches? Calculate: a) 75% of 40 b) 30% of 90 Revisio Give de a) De c) Pro e) M Conve 5. John invested R1 000 and by the end of a year he earned R50 interest. By what percentage did his investment grow? 6. In a bag of 35 marbles 28 are blue and the rest are red. Calculate the percentage of the blue marbles. 1. 2. mixe a) Cha 3. imp a) In the Grade 7 class, 16 of the 40 students are boys. What percentage of the class are girls? Si A. a​

Answer :

siddharthadixit757

Answer:

Let's break down the given tasks:

1. Conversion of percentages into common fractions:

a) 80% = 80/100 = 4/5

b) 12% = 12/100 = 3/25

c) 55% = 55/100 = 11/20

2. Conversion of fractions into percentages:

a) 100/33 = (100/33) * 100% ≈ 303.03%

b) 150/30 = (150/30) * 100% = 500%

c) 94% (Already in percentage form)

d) 20/16 = (20/16) * 100% = 125%

3. Comparing achievements in soccer matches:

Winning 12 out of 20 matches means a 60% win rate.

Winning 22 out of 40 matches means a 55% win rate.

Therefore, winning 12 out of 20 matches is a better achievement.

4. Calculations:

a) 75% of 40 = (75/100) * 40 = 30

b) 30% of 90 = (30/100) * 90 = 27

5. Percentage growth of investment:

John invested R1,000 and earned R50 interest.

Percentage growth = (Interest / Initial Investment) * 100%

= (50 / 1000) * 100%

= 5%

6. Percentage of blue marbles:

In a bag of 35 marbles, 28 are blue.

Percentage of blue marbles = (28 / 35) * 100%

≈ 80%

7. Percentage of girls in Grade 7 class:

Out of 40 students, 16 are boys.

Percentage of girls = ((40 - 16) / 40) * 100%

= (24 / 40) * 100%

= 60%

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