Question

A) (m+n)/30st

B) 30(m+n)/st

C) 30(mt+ns)

D) 30(mt+ns)/st

E) mt+ns/30st

Answer 1

Jules can make m muffins in s minutes

so, Jules making rate is $\frac{m}{s}$

Alice can make n muffins in t minutes

so, Alice making rate is $\frac{n}{t}$

now, we can find total rate when they make together

total rate is

$=\frac{m}{s}+\frac{n}{t}$

now, we can combine it

$=\frac{mt+ns}{st}$

now, we can find total number of muffins in 30 minutes

$=30*(\frac{mt+ns}{st})$

so, option-C......Answer