What is the answer to divide 500 into the ratio of 3 to 7

The random variable x is the number of occurrences of an event over an interval of ten minutes. it can be assumed that the probability of an occurrence is the same in any two-time periods of an equal length. it is known that the mean number of occurrences in ten minutes is 5.3. the appropriate probability distribution for the random variable

Simplify 24÷(-2)(3)+7 a. -29 b. 3 c. 11

Could someone me with this question i’ve been stuck on it for 20 minutes