For each of the prime numbers less than 30, Wallace writes down all the number's positive factors. What is the sum of all the numbers Wallace writes down?

If the sum of three prime numbers is 31 and their
product is 1001, what is the largest of the three prime
numbers?

Please just don’t guess I have no clue where to start?!!will give if you explain rlly well

You’re ordering more thread for blue jeans co. you usually purchase from ted’s threads, which sells 12 thread spools for $27. you recently received a notice from wade's wares that says you can buy thread from them for $2.30 each for the first 2 dozen and $2 a spool thereafter. you need to order 5 dozen spools. what percentage can you save by going with wade’s wares?