It is less than 100 and greater than 10. You use a total of 15 base ten blocks to show this number. The number of ones block is greater than the number of ten blocks. One of the digits is 6.

69

Step-by-step explanation:

Let x is the ones digit Let y is the tens digit

Given that:

You use a total of 15 base ten blocks to show this number:

x + y = 15 (1)

One of the digits is 6, so substitute into (1) we have another digit equals to: 9 Because the number of ones block is greater than the number of ten blocks

y > x

y = 9 and x = 6

So that number is: 69.