GMAT Exam

A number N, is a positive integer with the special property that 3 times its unit is equal to 2 times its tens digit. How many such numbers exist between 10 & 99?

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GMAT Other Question

What is the greatest value of a positive integer n such that 3n is a factor of 1815? If the monthly traveling expenses of a person are partly constant and partly vary with the number of miles that he travels in a month. When he travels 150 miles the total traveling expenses are Rs 800 and when he travels 180 miles the total traveling expenses are Rs 900. Find the total monthly expenses in a certain month in which he traveled 300 miles?