The sum of three numbers is 301. The second number is 3 less than twelve times the first number. The third number is 4 more than seven times the first number.

1 answer

Translate the "math" into English ...

first number: x
second number: 12x - 3
third number: 7x + 4

finally:
x + 12x-3 + 7x+4 = 301

solve for x, etc.