Quantitative Aptitude - Arithmetic Ability Questions

If the number 247_679 is completely divisible by 9, then the smallest whole number in the place of the blank digit will be

A wholesaler purchased 7 hair clips for a rupee. How many for a rupee must he sell to get profit of 40%.

A and B can do a piece of work in 72 days. B and C can do it in 120 days and A and C can do it in 90 days. A alone can do it in:

The length of the common chord of two intersecting circles is 12 cm. If the diameters of the circles are 15 cm and 13 cm, then what is the distance (in cm) between their centers?

What is the distance between the points (4,7) and (­1,­5)?

If (8 - 10x) - (13x - 2) = -9, then the value of x is

What should be added to 8(3x - ­4y) to obtain 18x ­- 18y?

What is the HCF of 36, 72 and 126?