exam
Maths Puzzle
Numerical Ability
How many pounds of 70% Columbian coffee must be added to ten pounds of 90% Columbian coffee to have 75% Columbian coffee?
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exam Other Question
A number between 300 and 400 is forty times the sum of its digits. The tens digit is 6 more than the units digit. Find the number.
Can you explain how to figure this problem (6±√8)/2 and provide answer ?
Thank You.