The requried number y must be less than 25 in order for the statement "5 less than a number y is under 20" to be true.
The phrase "5 less than a number y is under 20" can be represented as an inequality:
y - 5 < 20
This inequality states that if we subtract 5 from a number y, the result will be less than 20.
To solve this inequality for y, we can isolate y by adding 5 to both sides of the inequality:
y - 5 + 5 < 20 + 5
y < 25
Therefore, the number y must be less than 25 in order for the statement "5 less than a number y is under 20" to be true.
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