3 years ago

Perimeter of 24.5 and 31.7

1 answer:

7 0

If they are the sides of rectangle, then it's perimeter would be:

2(l+b) = 2(24.5+31.7) = 2(56.2) = 112.4

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GuDViN [60]

Let n be unknown number, then 1/5 of this number is 1/5n. When you add these two numbers, you get

$n+\dfrac{1}{5} n.$

You know that this sum is equal to 24, so

$n+\dfrac{1}{5} n=24.$

1. Multiply this equation by 5:

$5n+n=120.$

2. Solve it:

$6n=120,\\n=120:6,\\n=20.$

Answer: n=20, correct choice is B.

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Nataliya [291]

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Law Incorporation [45]

Answer:

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