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honeymoonxo
To find the cost of one, you would have to divide 10 with 4 to get 2.5. So 1 team(or ream? i'm not sure on what you mean.) is equal to $2.50. Multiply that with 6 to get $15.00 :) 
x
4 reams:$10
6 reams:?
6×10÷4=$15. As a result, it will cost $15 for 6 reams of paper at this rate. Hope it help!