HSSC TRICK (EDU PARK)

1. Squaring a number with lightning fast speed Well you might have come across various tricks to find the square of a number, but I can bet you that my trick is the simplest and the fastest :) Firstly memorize squares of numbers upto 25. I think many of you might be knowing it already, but for those who don't, please mug it. Now this trick will help you in squaring numbers upto 125 and trust me, for SSC you need this much only. (a) For numbers close to 50 (i) Numbers less than 50 (ii) Numbers greater than 50 The process is almost same - Compute (N - 50) Add this difference to 25 E.g. 56*56= 1. 56 - 50 = 6 2. Last two digits = 6 * 6 = 36 3. First two digits = 25 + 6 = 31 Therefore, 56 * 56 = 3136 (b) Numbers close to 100 (i) Numbers less than 100 (ii) Numbers greater than 100 The process is almost same - Compute (N - 100) Add this difference to N E.g. 107*107= 1. 107 - 100 = 7 2. Last two digits = 7 * 7 = 49 3. First three digits = 107 + 7 = 114 Therefore, 107

!! Profit Loss tricky solution !! 12 good questions with tricky solution 1. A trader uses a 800gm weight instead of 1 kg. Find his profit %. Soln: (He is buying 800 gm but selling 1000 gm. So, CP is for 800 gm and SP is for 1000 gm.) SP/CP = 1000/800 = 1.25 => 25% profit. 2. A trader uses 1 kg weight for 800 gm and increases the price by 20%. Find his profit/loss %. Soln: 1 kg weight for 800 gm => loss (decrease) => 800/1000 = 0.8 20% increase in price => profit (increase) => 1.2 So, net effect = (0.8) X (1.2) = 0.96 => 4% loss. 3. A milk vendor mixes water to milk such that he gains 25%. Find the percentage of water in the mixture. Soln: To gain 25%, the volume has to be increased by 25%. So, for 1 lt of milk, 0.25 lt of water is added => total volume = 1.25 lt % of water = 0.25 / 1.25 X 100 = 20%. 4. A trader bought an item for Rs. 200. If he wants a profit of 22%, at what price must he sell it? Soln: CP=200, Profit = 22%. So, SP = 1.22CP = 1.22 X