Find the ODD fraction. 18/72, 24/96, 51/204, 108/432, 18/90

Correct option is A

Problem: Find the ODD fraction from the following:

​$$\frac{18}{72}, \frac{24}{96}, \frac{51}{204}, \frac{108}{432}, \frac{18}{90}$$​​

Solution:

Simplify each fraction:
​$$\frac{18}{72} = \frac{18 \div 18}{72 \div 18} = \frac{1}{4}\\\ \\\frac{24}{96} = \frac{24 \div 24}{96 \div 24} = \frac{1}{4}\\\ \\\frac{51}{204} = \frac{51 \div 51}{204 \div 51} = \frac{1}{4}\\\ \\\frac{108}{432} = \frac{108 \div 108}{432 \div 108} = \frac{1}{4}\\\ \\\frac{18}{90} = \frac{18 \div 18}{90 \div 18} = \frac{1}{5}\\\ \\$$​​

The first four fractions simplify to $$\frac{1}{4}$$​, while the fraction $$\frac{18}{90}$$​ simplifies to $$\frac{1}{5}$$​. Hence, $$\frac{18}{90}$$​ is the odd fraction.

Final Answer: The odd fraction is $$\frac{18}{90}.$$​​