exam Maths Puzzle Numerical Ability

A nut mixture contains 10% cashews. How many kilograms of the mixture and how many kilograms of cashews should be mixed to give 6 Kg of a nut mixture which is 25% cashews?

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Hi I am bnot sure how to do these two problems. I hope some one can help me. Thank you very much.

1. Solve by factoring:
x2 � 9x = -8

2. Solve using the square root property:
2x2 � 5 = 93 i need help with (2k+1)7. this is distributive property. its usually a number in front of the parenthesis but for this particular problem there is not so i am really confused