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1 kg of cocoa = x

1 kg of coffee = y

x=y-3.60 -------------------- 1

then

2y + 3x = 74.20-----------2

substitute equation 1 in 2 .

2y + 3(y- 3.60) = 74.20

2y + 3y - 9.18 = 74.20

5y - 9.18 = 74.20

5y = 65.02

y = 65.02 / 5

y = 13.004

1 kg of coffee powder = 13.004

put y in equation 1

x = y - 3.60

x= 13.004 - 3.60

x = 9.404

1 kg of cocoa = 9.404

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Q: 1 kg of cocoa powder costs 3.60 less than 1 kg of coffee powder If the total costs of 2 kg of coffee powder and 3 kg of cocoa powder is 74.20 find the cost of 1 kg of cocoa powder?
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