Sure! Let's break down the information given:
4 in the tens column: _ _ 4 _
2 so that it has a higher value than any of the other digits: _ _ 4 2
The remaining two digits so that 7 has the higher value: 7 _ 4 2
To make the number, we arrange the digits from left to right: 742. So, Layla's four-digit number is 742.