book Maths Puzzle Numerical Ability

the value of a building lot this year is $78,000. this is three times its value 18 years ago. find its value 18 years ago.

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book Other Question

How many liters (L) of a 10% silver iodide solution must be mixed with 7 L of a 4% silver iodide solution to get a 6% solution? A train traveling at 60 kph covers a given distance in 3 hours. By how many kilometers per hour must its rate be increased so that it will travel the distance in one-half hour less time?