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Mathematics application problems in the seventh grade next semester (4 problems) (inequality unit)! ! ! Solve! ! !
At least xcm is required to set the fuse.

x/ 1.2 >= 400/5

x & gt= 96

(2) Suppose he answers question X at least correctly.

x * 4-(25- 1-x)* 1 & gt; = 80

x & gt=20.8

He must get at least 2 1 correctly.

(3) Last year, the annual profit of the whole factory reached at least X million yuan.

x/240-(x- 100)/280 & gt; = 6000/ 10000 x & gt; = 308

(4) 10b+a & lt; 10a+b a & gt; b

10b+a & gt; 10a+b a & lt; b

10b +a = 10a +b a=b