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A bag contains purple marbles and white marbles, 96 in total. The number of purple marbles is 6 less than 5 times the number of white marbles. How many purple marbles are there?

Sagot :

hnoelleashley
PURPLE MARBLES=P
WHITE MARBLES=W

First, write out an equation showing the number of purple marbles.
P=5W-6
Then, write out the main equation.
W+P=96
W+5W-6=96
Add 6 to both sides.
W+5W=102
6W=102
Divide both sides by 6
W=17
Now that we know there are 17 white marbles, we can go back to the equation about how many purple marbles there are. 
P=5W-6
Plug in the value for W, which is 17.
P=5(17)-6
P=85-6
P=79

To make sure your answer is correct, check your work by plugging in the values for P+W=96.
79+17=96
Answer: There are 79 purple marbles.
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