Adam bougth 23 pencils 15 erasers and ...

Adam bougth 23 pencils 15 erasers and 20 shapeners form a stationery shop and spent at total of $111. Bob bought 19 erasers, 12 pencils and 40 sharpeners from the same stationery shop and spent $10 more than Adam. Which of the two equations statisfy the above two conditions, if the price of pencil is $a , price of an eraser is $b and price of a sharpener is $ c?

23a + 15b + 20c = 111, 19a + 12b + 40c =101

23a + 15b + 20c = 111, 19b + 12b + 40c = 121

23a + 15b + 20c = 111, 12a+19b + 40c = 101

23a + 15b + 20c = 111, 12a + 19b + 40c =121

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