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Maths Puzzle
Numerical Ability
What is (-1)(a+b+c)
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A chemist mixes 10% citric acid solution with a 50% acid solution to form 40ml of a 40% solution. How much of each solution should be used in the mixture?
Factorise completely: (^= squared)
1. 6+2x
2. xy-x
3. b(2x-y)-c(2x-y)
4. 15x-3x^
5. 2p(3-q)+3(q-3)
6. x^+xy+y^+yx
7. a^-16
8. 4y^-81
9. x^-9x+18
10. x^n-5xn=