Book Maths Puzzle Age Problem

John is 4 years old & his sister is three times as old as he. When John is 12, how old is his sister ?

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Book Other Question

Factor the following polynomials:
1. 3+x^2-13x
2. x^2+5-7x
3. 9-17y+8y^2
4. 4T^2-7-3T
5. x^2-100
6. 125+R^3 What is a real root of K so that Kx^2+6x+k=0 has a double root?