The minimum number of sets of knives Indigo should buy is 9.
An inequality is a relation which makes a non-equal comparison between two numbers or other mathematical expressions. It is used most often to compare two numbers on the number line by their size.
Here, Let the minimum number of sets be x.
restaurant needs at least 430 knives
currently restaurant have 269 knives
each set contains 18 knives.
According to question,
18x + 269 ≥ 430
18x ≥ 161
x ≥ 161/18
x ≥ 8.94
Thus, the minimum number of sets of knives Indigo should buy is 9.
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