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The expression is simply: 9+q
-3 ≤ (6-q)/9 ≤ 3 -27 ≤ 6-q ≤ 27 -33 ≤ -q ≤ 21 -21 ≤ q ≤ 33 (the direction of inequalities change when multiplied by a negative number)
Q can do the work in 6 days. ( Time taken by P will be more than Q i.e their time ratio will be 150:100 and this is to 9:x, or 150:100::9:X which will give value of X as 6)
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