13
5a+30×4<500
5a<500-30×4
5a<380
a<76
14
80×4+X>1000
X>1000-80×4
X>880
15
3X+2Y<1000
16
4a+7b>3000
13
5a+30×4<500
5a<500-30×4
5a<380
a<76
14
80×4+X>1000
X>1000-80×4
X>880
15
3X+2Y<1000
16
4a+7b>3000
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