The diffence between a number x and 13 is 18

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?

John has 1/2 pound of oranges to share with julie. if they share the oranges equally, how much will each of them have?