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Math problem watermelon three plums, one yuan four bananas, one hundred yuan twelve. These things add up to exactly 100.
Buy x watermelons, y plums and 12z bananas.
Then 3x+4y+ 12z= 100 Yuan -( 1)
X+y+ 12z= 100 quantity -(2)
Equation (1)-(2)
Get 2x+3y=0.
Because x and y are definitely not less than zero.