Let's break it down:
first number = 30
[tex]\begin{gathered} su\text{ m = addition} \\ su\text{ m of 5 and 7 = 5 + 7} \\ =\text{ 12} \end{gathered}[/tex]Qoutient is the result obtained when you divide a number by another number.
quotient of 30 and the sum of 5 and 7 means we will divide the first number (30) by the second statement after the 'and' (5 and 7).
quotient of 30 and the sum of 5 and 7 is:
[tex]=\frac{30}{5\text{ + 7}}[/tex]
