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how to solve quantitative ability questions?

find the three natural no. whose sum is 30

I am scoring 30-50 marks in mocks.
how can I get 100+ marks in CAT?

how many four digits odd no. can be formed such that every 3 in the no, is followed by a 6?

raju has forgotten his six digit id no. he remembers the following the first two digits are either 1,5 or 2,6 the no. is even and 6 appears twice.if raju uses trial and error process to find his ID no. at the most, how many trials does he need to suceed

Akhilesh Singh sir please help me to solve the question posted in the previous question please Akhilesh sir please

find the value of 72540/5 + 72540/25 +72540/125 & the ans is given on my book is 17967.6 how to solve Akhilesh Singh sir please help me to solve this the process that U have said once is not matching with the ans in my booklet and if the ans in my booklet is wrong then please let me know

vocab

sides of cyclic quadrilateral are 9,10,12 and 16.if one of its diagonal is 14.find the other diagonal?

how do i solve parajumbles