Okay, say this is your question. " You and three friends go out for dinner. The bill comes to $77. If you pay $20 and your three friends all ordered the exact same thing, what amount will each of your friends have to pay? I used f as the variable to express how much the friends have to pay " F=(77-20)/3 subtract what's in the parenthesis first then divide by 3 F=(77-20)/3 F=57/3 F=19
