Solve the equation 3n-n=b-1 for n in terms of b

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.

50 points~ ! i have to turn this in tomarrow

Afamily has two cars. the first car has a fuel efficiency of 25 miles per gallon of gas and the second has a fuel efficiency of 15 miles per gallon of gas. during one particular week, the two cars went a combined total of 1025 miles, for a total gas consumption of 55 gallons. how many gallons were consumed by each of the two cars that week?