Question

72 is divided into 2 parts such that 12 timesof first when added to 5 times of second makes 472 find each part

Answer 1

Let 2 numbers be X and Y.
12x+5y=472----------(1)
x+y=72--------(2)
multiplying second equation by 5,
By solving we get that X is equals to 16 then why is equals to 56.