25
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The number is 5/7.
Zero
The direction of the inequality is reversed. Note that the if the inequality included "or equals" before, then it will after. 4 < 5 multiplied by -1 gives -4 > -5 5 >= 4 multiplied by -1 gives -5 <= -4
x * 10 = 5, divide both sides by 10 and cancel, gives x = 5/10 = 0.5
4 multiplied by 5 is 20.