A4. In Singapore, $\frac{3}{4}$ are Chinese, $\frac{1}{6}$ are Malay, and $\frac{1}{20}$ are Indian, while the number of residents of other races is 85,000. How many million people does Singapore have?
(A) 1.6
(B) 2.55
(C) 4.2
(D) 6
(E) none of the above
A4. We set up the equation $\frac{3}{4} x+\frac{1}{6} x+\frac{1}{20} x+85000=x$. The solution to the equation is 2550000 or 2.55 million.