book Maths Puzzle Numerical Ability

you bought 20 litre's of ammonia to clean your house. how many litre's of water does it take to make 10 litre's of 10% ammonia solution?

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Hello! My name is Lavalle. I am having trouble with multiplying/dividing decimals. Please help me.
5167 x 0.19
2.163 x 0.008
Please Help me, Thank You please can i get help wit finding the axis of symmetry of y=2x to the second power+8x-2

and i ned help on finding the coordinates formula
y=-x to the second power-5x-5