Quantitative Aptitude - Arithmetic Ability Questions

Find the odd numbers/letters/numbers from the given alternatives.

ax + 5y = 8 has slope of -4/3. What is the value of a?

What is the value of {[sin (x + y) – 2 sin x + sin (x – y)]/[cos (x – y) + cos (x + y) – 2 cos x]} × [(sin 10x – sin 8x)/(cos 10x + cos 8x)]?

If (1 + sinA)/cosA + cosA/(1 + sinA) = x, then the value of x is

If 1/(1 + cosA) + 1/(1 ­- cosA) = x , then value of x is

Find 2 consecutive natural numbers, sum of whose squares is 25.

If x+3y=-3x+y, then x22y2 is equal to

12 men or 30 boys can complete a work in 72 days. How many days will 48 men and 24 boys will take to complete the same work?