exam
Maths Puzzle
Numerical Ability
{{{ 2(4i+3)^2 }}}
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exam Other Question
A chemist needs to mix 20 liters of 40% salt solution with some 70% solution to get a mixture that is 50% salt. How many liters of 70% solution should be used?
the graphic of
2x-3y=0
y=x-1