smc

Question

If a = 1,~ b = 10, ~c = 100, and d = 1000, then (a+ b+ c-d) + (a + b- c+ d) +(a-b+ c+d)+ (-a+ b+c+d) is equal to

Accepted Answer

Adding all four of the equations up, we can see that it equals 3(a+b+c+d) This is equal to 3(1111) = 3333