Author name: Archit Gulia

Question : Radius of sphere is increased by 50 percent. What will be the percentage increase in its volume?प्रश्न: एक गोले की त्रिज्या 50 प्रतिशत बढ़ जाती है। इसकी आयतन मात्रा में कितने प्रतिशत की वृद्धि होगी? Answer: 3. 237.5 percent Solution:Volume = r = Radius From above formula : volume is directly proportional to

Questions : A train of length 384 metres crosses an electric pole in 12 seconds and crosses another train of the travelling in opposite direction in 12 seconds. What is the speed of the second train? 384 मीटर लंबी एक ट्रेन एक बिजली के खंभे को 12 सेकंड में पार करती है और विपरीत दिशा

Question: What is the curved surface area of a cylinder having radius of base as 70 cm and height 14 cm ? Answer: 1. 6160 Solutions: csa=2(3.14)r X h=6154 nearest answer 6160

Question: The marked price of an article is 60 percent more than its cost price. If 20 percent discount is given, then what will be the profit percentage? Answer: 1. 28 percent Solution: marked price= 1.6 times cost pricem=1.6 cs(selling price)= m-m(0.2)s=0.8 m = 0.8(1.6)cprofit = (s-c)/c=0.28percentage 28 percent

Question: If the cost price of 6 pens is the same as the selling price of 5 pens, find the profit/loss percentage. Answer: 1. 20% profit Solution: cost price be c. selling price be s.6c=5sprofit = (6c/5 – c)/100=20 percent profit

Question: IF 45 percent of X is equal to 15 percent of Y, then what is the value of X:Y? Answer: 4. 1:3 Solution: 0.45x=0.15y3x=yx:y=1:3

Question: The product of two numbers is 720 and their Highest common factor is 4. What is the Least common multiplier of these numbers? Answer: 3. 180 Solution: product of two numbers= HCF X LCM720= 4 LCMLCM= 180

Question: Rs. 9000 is lent at the rate of 80 percent per annum on compound interest (compounded half yearly). what will be the compound interest of 12 months? Answer: Rs. 8640 Solution:interest= PXRXT/100Compound interest be x(9000(0.5)(0.8)+ 9000(1+0.5(0.8))(0.8)(0.5))/1003600+5040Rs 8640