Quantitative Aptitude - Arithmetic Ability Questions

7/15 of 5/3 of a number is greater than 7/9 of 3/5 of the same number by 9. Find the quadruple of the number.

X can finish 25% of a work in a day. Y can do 12.5% of the same work in a day. In how many days, will both of them finish the work together?

Arun and Amit can do a piece of work in 9 days and 12 days respectively. If they work for alternate days and Amit starts the work first, then in how many days 35/36 parts of whole work will be completed?

If 169 is subtracted from the square of a number, then the result obtained is 7056. What is the number?

In a motor of 120 machine parts, 5% parts were defective. In another motor of 80 machine parts, 10% parts were defective. For the two motors considered together, the percentage of defective machine parts were

Select the odd word/letters/number/number pair from the given alternatives.

If x + y = 12 and x2 + y2 = 94, then xy is 

Coefficient of x2in (x + 9)(6 - 4x)(4x - 7) is