Book Maths Puzzle Age Problem

Ann's age is seven-tenths of bill's age. In 4 years Ann's age will be eight- elevenths of Bill's age. How old is Bill now?

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Book Other Question

Find all rational roots of:

4x^3-7x^2-21x-18=0
can u help me with this? use the graphing method to solve the linear system and tell how many solutions the system has: 2x+4y=8
3x+6y=1