{5x-3(20-x)≥70,5x-3(20-x)≤90

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{5x-3(20-x)≥70,5x-3(20-x)≤90{5x-3(20-x)≥70,5x-3(20-x)≤90{5x-3(20-x)≥70,5x-3(20-x)≤90据题意,70≦5x-3(20-x

{5x-3(20-x)≥70,5x-3(20-x)≤90
{5x-3(20-x)≥70,5x-3(20-x)≤90

{5x-3(20-x)≥70,5x-3(20-x)≤90
据题意,70≦5x-3(20-x)≦90
70≦8x-60≦90
130≦8x≦150
16.25≦x≦18.75