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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?