A tricky subnetting question

"Distribute 6 sub-networks with 64 hosts from the given network 140.25.130.0/23 . Write the network and broadcast addresses."

In here I would consider using six /25 sub-nets with each supporting 2^7=128 addresses, which would give a total of 6 * 128 = 768 addresses. However, the given subnet mask /23 only supports 2^9=512 addresses.

So, a question arises from it: "What to do in this type of situations?".