3 would be 36 4 is 47 6 is 69 and 8 is 91
Step-by-step explanation:
3(-x+2x+1)=x-1
3(x+1)=x-1
3x+3=x-1
3x-x=-1-3
2x=-4
x=-2
So i guess the question is how much red gravel can they buy?
Red gravel: 3000 pounds
Black gravel: 2000 pounds
x+y=5000
0.80x+0.55y=3500
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