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How to think in series while take a mock test

hindi m kese hoga

dear sir ,

can you share the only previous questions paper with answer of GK and GS??

Sumit purchase two watches for rs. 17334. Hr sold first watch at 6% loss and seco d at 8% profit and found that the loss amount is equal.to the profit amount. Then find the difference between the cost priceof both watches?

a:b=2:3, c:d=4:5, d:e=3:1, a:d=2:5, find ab+cd/BC+de

this is one of a question in cracku ratio test. in the solution, while calculating bc+de, you have divided 25x square/3 and taken LCM. why have u divided it by 3 ?

x-1/x=3
find
x^4-1/x^4.