En un balancín están sentados dos niños, uno pasa 20 Kg y se sienta a 2 m del fulcro, el otro se va moviendo hasta encontrar el equilibrio a 2,5 m. ¿Cuánto pesa el segundo niño?

(c); a male black bear eats fish in an area of a lake, so other black bears can't

answer:

i havent taken the psat, but i have the sat, make sure to bring some snacks, because youre in there forever, 2 sharp number two pencils, an sat approved calculator, and maybe a jacket.   your phone and any books will be taken up, so don't try to bring them(but they will be given back at the end of the testing).   good luck!   i hope you do well!