Answer:
Erin has $200
Explanation:
Kevin = K
Erin = E
30% of Erin = 0.3E
K = E - 0.3E
K = 140
Substitute
140 = E - 0.3E
140 = 0.7E
Divide both sides of the equation by 0.7
E = 200
Hope this helps :)
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