The mystery number is a four-digit number. its digits are 5, 4, 7, and 3. the 5 and the 7 are the two middle digits.the 5 comes after the 7.the 3 is not the first digit.what is the mystery number?

Step-by-step explanation:

Given: The mystery number is a four-digit number.

The digits used to make the number : 5, 4, 7, and 3.

Since , 5 and the 7 are the two middle digits.

Then , the number would look like

The 5 comes after the 7.

Then , the number would look like  [i.e.   is not representing  the mystery number]

The 3 is not the first digit, then 4 must be the first digit.

Hence, the mystery number should be :

If I would have been in place of you, I would use different contrasting colours or purple, yellow and green (for leaves). But, it's all upon your wish! :)

Hope it helps.