book Maths Puzzle Numerical Ability

please help me with this...


5 (t- 0.4) + 6t =0

will you show me how you did it?

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book Other Question

I just can not figure out how to set this one up.....and I need the answer quick. Please Help Me!!!!!

Ed and Dave are going to divide a cash prize of $14,000 in a ratio of 2 to 5. How much will Dave receive?
Sir i need your help, i truly stumped with this one..
How many grams of an alloy containing 35% nickel must be melted with an alloy containing 65% nickel in order to obtain 20 g