Quantitative Aptitude - Arithmetic Ability Questions

Which of the following is not a quadratic equation?

Rameshwar goes on a trip on his motor-cycle and rides for 405 kms. If he rides for 6 hours at a speed of 45 km/hr, find at what speed he travels for the remaining 3 hours of the journey?

Meghnad can do a piece of work in 45 hours. If he is joined by Jayshri, who is 50% more efficient, in what time will they together finish the work?

The average of three numbers is 40. First number is 4/3 of the third number. If third number is 20 less than second number, then what is the value of second number?

A canteen requires 56 kgs of rice for seven days . The quantity of rice required for the months of April and May together is

Three electronic devices make a beep after every 48 sec, 72 sec and 108 sec respectively. They beeped together at 10 a.m. The time when they will next make a beep together at the earliest is

The value of  (0.3)2/100=?

Find out the odd word/letters/number/number pair from the given alternatives.