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This is one of the only questions I can't figure out in the study guide:

 May 11, 2018
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a) 7/10[d +5/6] = 7,                 multiply both sides by 10 / 7

[d + 5/6] = 10

[6d + 5] / 6 = 10                  cross multiply

6d + 5 = 60                         subtract 5 from both sides

6d =55                                divide both sides by 6

d = 55 / 6

 

b) 

5c/4 - 2c/3 =7/10              Put the LHS over the CD=12

[15c - 8c] /12 = 7/10

7c / 12 = 7/10                   cross multiply

7c = 84/10                        divide both sides by 7

c =84 / 10 x 1/7

c = 84 / 70                        divide both sides by 14

c = 6/5

 May 11, 2018
edited by Guest  May 11, 2018

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