Subject
Quantitative Aptitude
Topic
Solution
If x = y + 4 and x = 20-y, then x2-y2=
If x = y + 4 and x = 20-y, then x2-y2=
ক)
16খ)
80গ)
144ঘ)
256Explanation
x = y + 4 or, x - y = 4 And, x = 20 - y or, x + y = 20 Thus, x2-y2= (x + y) * (x - y) = 20 * 4 = 80Related questions
If A+B+C=10, A+B = 7 and A-B =5, What is the value of C?If x=1 - q and y = 2q+1 , then for what value of q. x is equal to y ?Which one of the following is a solution to the equation x4– 2x2= -1?If 3√x = 2√3, What is the value of x?50 g of an alloy of gold and silver contains 80% gold(by weight). The quantity of gold, that is to be mixedup with this alloy, so that it may contain 95% gold is?If (4-x)/(2+x) = x, what is the value of x2+ 3x -4?If n is a number such that (-8)2n = 28+2n, then n=If a+b=13 and a-b= 3,then value of a2+b2=?