If `x %` of 75 is 12, then `x=` (a) 8 (b) 10 (c) 12 (d) 16

If x% of 75 is 12, then x=8 (b) 1012 (d) 16

If x % of (12)/5 is (18)/(25), then x= (a) 30 (b) 40 (c) 72 (d) 50

If x^2+1/(x^2)=102 , then x-1/x=? (a)8 (b) 10 (c) 12 (d) 13

If 2 is a root of the equation x^2+b x+12=0 and the equation x^2+b x+q=0 has equal roots, then q= (a) 8 (b) -8 (c) 16 (d) -16

If 2 is a root of the equation x^2+b x+12=0 and the equation x^2+b x+q=0 has equal roots, then q= (a) 8 (b) -8 (c) 16 (d) -16

If 2 is a root of the equation x^2+a x+12=0 and the quadratic equation x^2+a x+q=0 has equal roots, then q= (a) 12 (b) 8 (c) 20 (d) 16

If 2 is a root of the equation x^2+a x+12=0 and the quadratic equation x^2+a x+q=0 has equal roots, then q= (a) 12 (b) 8 (c) 20 (d) 16

If the arithmetic mean of 7,\ 5,\ 13 ,\ x and 9 is 10 , then the value of x is (a) 10 (b) 12 (c) 14 (d) 16

At what rate percent per annum simple interest will a sum double itself in 10 years? (a) 8% (b) 10% (c) 12% (d) 12 1/2%

If x^(2)+(1)/(x^(2))=102, then x-(1)/(x)=8( b) 10 (c) 12 (d) 13