The ratio of two numbers can be gotten by dividing the first number by the second one, such that:
[tex]a\colon b=\frac{a}{b}[/tex]The question is provided to be:
[tex]75\colon90[/tex]Hence, we can rewrite the question to be:
[tex]75\colon90=\frac{75}{90}[/tex]We can simplify the fraction by dividing both the numerator and the denominator by 15:
Numerator:
[tex]\Rightarrow75\div15=5[/tex]Denominator:
[tex]\Rightarrow90\div15=6[/tex]Therefore, the ratio is:
[tex]\frac{5}{6}[/tex]ANSWER:
Fraction: ⁵/₆
Decimal: 0.833333