Others Maths Puzzle

how many pure salt must be added to 30kg of 2% solution of salt and water to increse it to a 10% solution?
give the proper solution?

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Others Other Question

make 100 with 6 9's . i.e 9,9,9,9,9,9 Q. Who among the following has written the famous book MalgudiDays?

(A) VSNaipauI
(B) Deepak Chopra
(C) Rabindranath Tagore
(D) VijayTendulkar
(E) RK Narayan