31. If a number is multiplied by two-third of itself the value so obtained is 864. What is the number ?
32. The product of two numbers is 9375 and the quotient, when the larger one is divided by the smaller, is 15. The sum of the numbers is :
33. If the product of three consecutive integers is 120, then the sum of the integers is :
34. A two-digit number is such that the product of the digits is 8. When 18 is added to the number, then the digits are reversed. The number is :
35. The sum of the squares of three numbers is 138, while the sum of their product taken two at a time is 131. Their sum is :
36. The sum of the squares of two positive integers is 100 and the difference of their squares is 28. The sum of the numbers is ?
37. A number when multiplied by 13 is increased by 180. The number is :
38. A positive number when decreased by 4 is equal to 21 times the reciprocal of the number. The number is ?
39. The difference between two numbers is 1365. When the large number is divided by the smaller one, the quotient is 6 and the remainder is 15. The smaller number is :
40. A number of two digits has 3 for its unit's digit, and the sum of digits is $$\frac{1}{7}$$ of the itself. The number is :
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