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3 years ago

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Four-fifths of my current age is greater than three-quarters of my age one year from now.

1 answer:

klasskru [66]3 years ago

8 0

Let current age be x, next we construct the inequalities for the age:
<span>Four-fifths of my current age is greater than three-quarters of my age one year from now.
</span>thus when we add 1 year to 3/4 of our current age and set the inequality
4x/5>3x/4+1......i

<span>Four-fifths of my current age is also greater than five-sixths of my age one year ago.
Thus when we subtract 1 from 5x/6 and set the inequality we get
4x/5>5x/6-1.......ii
solving the inequalities we obtain:
</span>4x/5>3x/4+1
x/20>1
hence multiplying both sides by 20 we obtain:
x>20

also

4x/5>5x/6-1
4x/5-5x/5>-1
-x/30>-1
multiplying both sides by 30 we get:
-x>-30
thus
x<30
therefore the possible values of my age will lie in the interval:
20<x<30
Thus our age is in the interval
(20,30)

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