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Anna [14]
3 years ago
12

If 81 is added to a number the result is 39 less than three times the number

Mathematics
2 answers:
solong [7]3 years ago
8 0

Answer:

60

Step-by-step explanation:

number is represented as x.

81 is added to a number is

81 + x

39 less than three times the number

3x - 39

So

81 + x = 3x - 39

Solve for x.

81 + x = 3x - 39 Add 39 to each side so 39 cancels on the right.

81 + x + 39 = 3x - 39 + 39

81 + x + 39 = 3x

81 + 39 + x = 3x

120 + x = 3x Subtract x from each side.

120 + x - x = 3x - x

120 = 3x - x

120 = 2x    Divide each side by 2

120/2 = 2x/2

120/2 = x

60 = x

Deffense [45]3 years ago
4 0

let x =the number

Step-by-step explanation:

81+x=3x-39

group like terms

81+39=3x-x

120=2x

120/2=2x/2

60=x

therefore x =60

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Total length of the string = \frac{5}{6} yard

Length of string used for craft = \frac{3}{5} of total length of string

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Length of the string left after use = Total length of the string - Length of string used for craft

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Reducing it to the lowest term, we get

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Step-by-step explanation:

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Answer:

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