Book
Maths Puzzle
Age Problem
Ann's age is seven-tenths of Bills 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
Where is the vertex of the graph of y=x^2-5?
The difference between two numbers is 15. When twice the smaller number is subtracted from three times the larger number, the difference is 58. What is the larger number?