if a is less than and not equal to b, it is written a < b
If a is less than or equal to b, it is written a ≤ b
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An expression of "4 less than b" can be represented as b - 4. This means you are subtracting 4 from the variable b. For example, if b is equal to 10, then 4 less than b would be 10 - 4, which equals 6.
The less than symbol looks like this: < This is where A < B ; A is less than B
b≥5 or b>=5
If a,b and c are any digit, not all zero, then 25000 < 25abc < 26000. SO 25001, 25345 and 25983 will do, as examples.
Well, technically any fraction less than 25 can be expressed as a numerator over 25, so the answer would be any fraction in the form of a/b where a is less than 25 and b is any number greater than 1. But seriously, why are we limiting ourselves to fractions less than 25? Live a little and embrace all the fractions out there!