A friend opened a stall on Dixon St called Mamak. It’s a part of the Friday night markets and is open until July. Their menu is limited (roti Canai $5, roti telur $6, teh tarik $3, satay $10/dz) but tasty. Try the rotis – the satay meat was a little tough. Great for late night snacks, though unfortunately it shuts at 11pm. Still waiting for a 24 hour mamak place in Sydney.
Two minutes to solve, no calculators:

My brain’s not working – I’ve hit a mental blank with this – answer in the comments section please.