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How well is your arithmetic intelligence developed? 2

How well is your arithmetic intelligence developed? 2 You think you can solve any problem? What about arithmetic problems? Do this test and you will see what's your arithmetic intelligence's level!

Question 1 from 10: What is the sum of all digits (not numbers) that make up the sequence of 1, 2, 3, 4 ,. . . up to 99?
Question 2 from 10: What is the highest figit resulting from the next multiplication 11111111 * 11111111?
Question 3 from 10: What is the smallest positive number that has 12 different positive divisors, including himself and 1?
Question 4 from 10: What is the sum of all the numbers that can be formed from the following five digits: 1, 2, 3, 4, and 5?
Question 5 from 10: What is the largest number that can result by multiplying the numbers that their sum is 17 (ex: 1 + 10 + 6 = 17)?
Question 6 from 10: The difference between a two-digit number and the number obtained by changing its digit position is 72. What is the sum of the two digits of the initial number?
Question 7 from 10: How many three-digit numbers have exactly five divisors, including 1 and it self?
Question 8 from 10: 50 people attended a conference where each one handed each other only once. How many hand-outs were at that conference?
Question 9 from 10: In a family there are four children, and the sums of any three children's age are: 30, 32, 32 and 35 years old. What is the older brother's age?
Question 10 from 10: Anna has a salary equal to 7/8 from David's sallary. Anna is spending an amount of money equal to 7/8 from how much David is spending. Each one of them is spending less than the sallary is. Who saves more money?