When full, the gas tank of a car holds 15 gallons. it now contains 12 gallons. what percent represents how full the tank is

Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

Solve this riddle: i am an odd number. i an less than 100. the some of my digit is 12. i am a multiple of 15. what number am i?