A website Maths Puzzle Numerical Ability Profit and Loss

from total income, A sales spent 20000 in advertisement ,half of the reminder on commissions and had 6000 left.what was the total income.

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A website Other Question

x more than 50% fishes of a pond are taken and fishes equal to square root of total number of fishes are sold for aquarium purposes. 1 more than 10% of the remaining fishes are purchased by a shopkeeper and fishes equal to square root of the number of fishes purchased by shopkeeper are sold for food purposes. If 16 fishes are sold for food purpose, then minimum possible value of x will be 6x5=31
7x6=43
8x7=57
9x8=?