exam
Maths Puzzle
Numerical Ability
How do I simplify .4/-.18?
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I need help. For the following problem I found no solution:
2log2 (x+6) - log2 16 = 2
heres my work:
log2 x^2+36-16 = 2
x^2+20 = 2^2
x^2+20 = 4
x^2=-16
then there is no real number for the square root of -16
How many gallons of a 4% acid solution should be mixed with 20 gallons of a 10% acid solution to obtain a mixture that is 5% acid?