Answer:
balanced reaction: <u>1</u> C3H8 + <u>5</u> O2 ----> <u>3</u> CO2 + <u>4</u> H2O
So for every two girls, there's four boys. There are twice as many boys than girls, so the number of girls • 2 = your answer.
51 • 2 = 102
you have to calculate the SID number and then take it upon yourself and divided X it's actual number and then there's a chance and the answer would be c.72