SOLUTION: Adam will use x black stone tiles and y gray stone tiles to cover his patio floor. Black stone tiles cost $5 each and gray stone tiles cost $4 each. He can spend up to $150 on his

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Question 1136233: Adam will use x black stone tiles and y gray stone tiles to cover his patio floor. Black stone tiles cost $5 each and gray stone tiles cost $4 each. He can spend up to $150 on his project, and he wants the number of gray stone tiles to be less than half the number of black stone tiles.
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
5x+4y<=150
y<0.5x
Therefore, 5x+2x<150 now less than, not equal to
7x<150
x < 21
105+4y<=150
4y<=45
y<=11
(21, 11) works for the first inequality but not the second.
(21, 10) works for both. Cost is $105+40 or $145.