Quantitative Aptitude - Arithmetic Ability Questions

At 6% simple interest per annum a sum of money became Rs. 834 in 6.5 years. The sum initially invested was

The age of Dr. Pandey is four times the age of his son. After 10 years , the age of Dr. Pandey will be twice the age of his son . The present age of Dr. Pandey's son is

If the product of two numbers is 2522 and their LCM is 97 then their HCF is

A tetrahedron has 4 vertices. How many edges does it have?

What should be added to 5(2x-y) to obtain 4(2x - 3y) + 5(x + 4y)?

If x=aCosθCosΦ, y = aCosθSinΦ and z= aSinθ, then the value of x2+ y2 + z2 is

If sinA + sin2A =1 then what is the value of cos2A + cos4A

If ( x - 5)2 + (y - 2)2 + (z - 9)2 = 0, then value of (x + y - z) is