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WILL MARK BRAINLIEST!

Find the number:

7 times the difference of 9 and a number that amounts to 84.

Mary has 3 times the number of coins John has. Together they have 180 coins. how many coins does Mary have?

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Respuesta :

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1.) 84= 7 (9-x)

84= 63 - 7x (Distribute)

84-63= -7x

21= -7x

-3 = x

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2.) 3x + x= 180 (x= john's coins)

4x = 180 (combine like terms)

x = 45

3 * 45 =135

Mary has 135 coins


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