Brainteaser math 1. multiple me by 20 and the awnser is 10 what am 2.i am a prime number over 70 and less then 80 what am i . i am the largest 3 digit number that can be rounded up too 1000 what am i

Hi my sisters and brothers can tell me the answer because i don’t understand the question

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

Question 1 of 10 2 points different groups of 50 graduates of an engineering school were asked the starting annual salary for their first engineering job after graduation, and the sampling variability was low. if the average salary of one of the groups was $65,000, which of these is least likely to be the average salary of another of the groups? o a. $64,000 o b. $65,000 o c. $67,000 o d. $54,000