1. The problem is to solve and explain the expression 50:60. 2. The colon ":" typically represents a ratio in mathematics. 3. So, 50:60 can be read as the ratio of 50 to 60. 4. To simplify this ratio, divide both numbers by their greatest common divisor (GCD). 5. The GCD of 50 and 60 is 10. 6. Divide both terms by 10: $$\frac{50}{10} : \frac{60}{10} = 5 : 6$$ 7. Therefore, the simplified ratio of 50:60 is 5:6. 8. The ratio means that for every 5 units of one quantity, there are 6 units of the other.