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Lerok [7]
3 years ago
13

42% of 42 is 84% of what number?

Mathematics
1 answer:
galina1969 [7]3 years ago
4 0

Answer:

21

Step-by-step explanation:

42% of 42 is 84% of what number

Let the number be y

42% of 42 is 84% of y

NOTE: Of means multiplication

42/100 × 42 = 84 /100 × y

1764/100 = 84y/100

cross multiply over the equal sign

176400 = 8400y

divide by 8400

176400/8400 = 8400y/8400

y = 21

To verify

42% of 42 is 84% of a number

42% of 42 is 84% of y

42/100 × 42 = 84/100 × 21

1764/100 = 1764/100

17.64 = 17.64

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The diameter of a table tennis ball is 20 millimeters.
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