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Ostrovityanka [42]
3 years ago
9

Two thirds of a number is equal to 20 what is the number

Mathematics
1 answer:
goldenfox [79]3 years ago
4 0
To solve this problem, we should set up an equation, letting the unknown number be represented by the variable x.

2/3x = 20

To solve this equation, we just have to divide both sides of it by 2/3, because we are trying to get the variable alone on the left side of the equation.

x = 30

Therefore, the number is 30.
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At a certain hospital, 75% of the interns receive fewer than 6 hours of sleep and report feeling tired during their shifts. At t
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Step-by-step explanation:

Creating a table with the information will help us.

<6h of sleep - 75% reported tired | 25% reported ok

>6h of sleep - 70% reported ok | 30% reported tired

80% of all interns received <6h of sleep

Let's imagine that we have 100 interns at this hospital

             <6h               |          >6h          Total

Tired       75% of 80          30% of 20    

 ok         25% of 80          70% of 20

Total        80                |             20            100

             <6h                |          >6h            Total

Tired   |    60                |             6                66

 ok     |     20               |            14               34

Total   |     80               |             20             100

what percent of the interns report no feelings of tiredness during their shifts?

34/100 = 34%

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