How many two-digit numbers are divisible by 3 but not by 7?

Find the value of $$ {1\over{2×5}}+{1\over {5×8}}+{1\over {8 × 11}}+......{1\over {23 × 26}}=?$$

A number divided by 13 leaves a remainder 1 and if the quotient, thus obtained, is divided by 5, we get a remainder of 3. What will be the remainder if the number is divided by 65?

Direction : What should come in place of the question (?) in the following question.

23.56 + 134.44+ 4142.25=?

Which smallest number should be subtracted from 1000 so that results will be a perfect square? 

4/5 of a number is 10 more than two-thirds of the same number. What is that number?

Direction : What value should come in the place of question mark (?) in the following questions?

3505 × 69.89 ÷ 102 – 1699=?

Direction : What should come in place of the question (?) in the following question.

8934 – 3257 + 481 = ? + 2578