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four times a certain number is 92. what is the number?

seven times a certain number is 266. what is the number?

the sum of a certain number and 15 is 41. what is the number?

separate the number 24 into two parts so that one number is twice the other number.

if 5 times a number is decreased by 12, the result is 108. what is the number?

three less than three times a number is 45. what is the number?

mia is 4 years younger than her brother bob. if the sum of their ages is 18, how old are mia and bob?

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?