If `c+d=200,` what is `a+b?`

If ax-c=bx+d , what is x in terms of a, b, c, and d?

If a-b=4, b-6=c, c-2=d, and a+d=4 ,what is the value of a?

If a+b+c+d = 24,a+b=c+d,a+c = 2(b+d) and a = b , what is the value of C?

If (c)/(d)-(a)/(b)=x, a=2c, and b=5d , what is the value of (c)/(d) in terms of x?

If a, b, c and d are four positive numbers such that a+b+c+d=4 , then what is the maximum value of (a+1)(b+1)(c+1)(d+1) ?

If A = {a,b},C = {c,d}, what is the relation between sets A and C?

The average (arithmetic mean) of a, b, c, and d is 3 times the median. If 0ltaltbltcltd , what is a in terms of b, c, and d?

The mean of a, b, c, d and e is 36. If the mean of b, d and e is 32, what is the mean of a and c?