Let's represent the number as x. The given statement can be written as an inequality:
x * 10 + 17 ≤ 21
Simplifying the inequality:
10x + 17 ≤ 21
Subtracting 17 from both sides:
10x ≤ 21 - 17
10x ≤ 4
Dividing both sides by 10:
x ≤ 4/10
x ≤ 0.4
Therefore, the number must be at most 0.4.
The sum of a number times 10 and 17 is at most 21
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