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Meena goes to a post office to post mail/letter and parcels. The postal rate is given below: Letter weighing i) 25 gram or less - Rs. 15 ii) Per every additional 20 gram Parcel weighing - Rs. 7 i) 60 gram or less - Rs. 55 ii) For every additional 50 gram - Rs. 15 Meena wants to send one letter of weight 20 gram and two parcels of each to 310 gram and 460 gram respectively. How much money Meena have to pay?
What is correct: (i) In a Gram Panchayat there can be more than one village. (ii) Meeting of Gram Sabha held in each village. (iii) Meeting of Gram Sabha held in the headquarter of Gram Panchayat. (iv) Meeting of Gram Panchayat held in each village. (v) Meeting of Gram Panchayat held in the headquarter of Gram Panchayat.
Arjun buys milk at Rs. 30 per liter. He sells his milk in a 5 liter can in which he adds 1 liter water and the rest milk. If a liter of water costs Rs. 5 and he sells a can for Rs. 150, find his profit percentage in selling a 5 liter can?
The price of the essential commodity in the shop is given in the table, Item Quantity Price(Rs) Rice 500 gram 25 Wheat 1 kg 18 Gram seed 200 gram 15 Oil 1 litre 75 Pulses 300 gram 40 Manoj buys 1/2 kg Rice, 1 kg Gram seed, 1/2 kg Wheat, 1-litre oil and 600-gram pulses. How much money Manoj have to pay?
Firoz Merchant, a gold merchant want to mix a gold costing Rs.9 per gram with 27 gram of gold costing Rs. 7 per gram so that he may have a gain of 10% by selling the mixture at Rs. 9.24 per gram. Find how many gram of gold costing Rs. 9 per gram he had to mixed?
An aqueous solution with NaOH 10 g/L at the rate is 100 L/min and an organic compound with no NaOH at the rate 50 L/min were put into an extraction machine and produced aqueous solution with NaOH 1 g/L, what is the amount of NaOH in organic compound after extraction?
250 mL NaOH এর দ্রবণে 5.0g NaOH দ্রবীভূত আছে। ঐ দ্রবণে NaOH এর মোলার ঘনমাত্রা (Molar concentration) কত?
A man buys 45 liters of petrol for Rs. 62 per liter and 30 liters of kerosene at Rs. 25 per liter. He mixes both and then sells the mixture mentioning it as petrol. At what price must he sell each liter to get a profit of 30% on each liter he sells?
A chemical solution appears green when the salt concentration is 8 grams per litre (gpl) and red when it is 10 gpl. Pure water was added to the solution of 1 litre of 15 gpl solution till it turned green. Then 125 ml of the green solution is taken out and x grams of salt is added to the green solution to make it red. Another 500 ml of the final solution was taken out and y litres of green solution is added to get a resultant solution of concentration 9.6 gpl.  Assume adding salt doesn’t change its volume and find the ratio of x and y. 
A container has O2 at 5 atm and molar volume 2 liter/mole, if a = 9.24 atm(liter/mole), b = 0.0907 liter/mole, what is the temperature of O2? (Use vander waal equation)