A) (m+n)/30stb) 30(m+n)/stc) 30(mt+ns)d) 30(mt+ns)/ste) mt+ns/30st

Jules can make m muffins in s minutes

so, Jules making rate is

Alice can make n muffins in t minutes

so, Alice making rate is

now, we can find total rate when they make together

total rate is

now, we can combine it

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

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

1)is not similar since corresponding sides are not in the same ratio

2)are similar since corresponding sides are in the same ratio and corresponding angles are equal

hope it will

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