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Tanzania [10]
3 years ago
8

79x20=(80x20)-(nx18)

Mathematics
2 answers:
vodomira [7]3 years ago
5 0
79 × 20 = (80 × 20) - (n × 18)<em>        :First, multiply what is on the left of the equation</em>

1580 = (80 × 20) - (n × 18)<em>            :Then, solve for what is in the first parenthesis</em>

1580 = (1600) - (n × 18)<em>                :Then, act like there is a 1 in front of the negative                                                                        and distribute</em>

1580 = 1600 - 18n                         <em>:Then, subtract 1600 from both sides</em>

-20 = -18n                                      <em>:Then, divide the whole equation by -18</em> 

1.1 = n

<u>Your final answer is:</u>

<em><u>n = 1.1</u></em>
alina1380 [7]3 years ago
3 0
79*20=(80*20)-(n*18) \\\\ 1580=1600-18n \\\\ 1580-1600=18n \\\\ -20=18n \ |:2 \\\\ -10=9n \\\\ \boxed{n=-\frac{10}{9}}
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Two times the quantity of eight times a number plus two is equal to three the quantity of two times the same number minus seven
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The unknown number is - 2.5

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The equation will be formed as follows;

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