Question
There are thrice as many black vests as yellow vests in a sale. If there are 180 black and yellow vests altogether,
  1. how many black vests are there?
  2. how many more black vests than yellow vests?
3 m
(a)

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(b)

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There are thrice as many black vests as yellow vests in a sale. If there are 180 black and yellow vests altogether,
  1. how many black vests are there?
  2. how many more black vests than yellow vests?