exact odds at the Gold/Binger/Wasicka hand...

[quirkasaurus]

What if it played out this way:

Binger TT -- ALL IN AFTER THE FLOP
Gold -- folds
Wasika -- 8s7s CALLS

FLOP: 6s 5s X

What are Wasika's odds to make his flush, or straight
to beat Binger's Tens ?

I calculate them to be:

15 outs:
45 chances, and then 44 chances if he misses... so...

( 15 + 15 ) / (( 45 + 44 ) / 2 ) == 66% about.

My buddy says Wasika's odds were much lower, maybe 54%.
What is correct ?