Maths MCQs

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

Question: Swapnil can build a sofa in 16 days. Working together with Revathi he can finish the work in 129/17 days. Find the number of days taken by Revathi to complete the work if she works alone. Answer: 4. 128/9 days Solution:building a sofa workdone = wSwapnil can do in 16 days = w=16ss=speed of

Question: 25 percent of 20 percent of a number is equal to 250. What is the 35 percent of that number? Answer: 1750 Solution: 25 percent of 20 percent of a number x = 2500.25(0.2)x=25035 percent of the number =0.35×0.35x= (250x4x5x35)/100=5x2x5x35=1750

Question: Selling price of a table is Rs. 6875. If profit percentage is 25 percent, then what is the cost price of table? Answer: 2. Rs. 5500 Solution: s= Rs. 6875 cost price be cc+0.25c=1.25c=s=6875c= Rs. 5500

Question: If 72 binders can bind 720 books in 22 days, how many binders will be required to bind 660 books in 12 days? Answer: 3. 121 Solution:workdone for 1 book= (binders x days) / n.o of books=( 22 x72)/720workdone for 660 books in 12 days for (1 book work)= (binders x 12) /660(binders x

Question: The simple interest received on a sum for 40 years is 2/5 of the sum. what is the annual rate of interest? Answer: 3. 1 percent Solution:formula S.I= PXRXT/(100)2/5X = X(R)(40)/(100)R= 1 percent

Quesion: After working for 8 days. Rakhi finds that only 10 percent of the work is completed. She employs Poonam who is 20 percent more efficient than Rakhi. How many more days will they together take to complete the remaining work? Answer: 4. 360/11 days Solution: Total work =wRakhi speed to complete work xpoonam speed

Question: If M:N=9:6, then what is the value of (M+N):(M-N)? Answer: 3. 5:1 Solution: (M+N):(M-N)Dividing it by N on denominator as well as numeratorM/N=x=9:6=3:2(M+N):(M-N)=(x+1)/(x-1)=2.5/.5=55:1

Question: Marked price of a chair is Rs. 2000. After giving two successive discounts of 20 percent and x percent, the chair is sold for Rs. 1400. What is the value of x? Answer: 12.5 percent Solutions: bulding equation selling price after 1 st dsicount 2000-0.2(2000)=1600building equation after x discount1600-(0.01)x1600=1400200=0.01(x) 16001/8=12.5 percent

Question: If the length of a rectangle is increased by 14.28 percent, then by how much percentage its breadth should be reduced to keep the area same? Answer: 2. 12.5 percent Solutions:Area of rectangle be x. length be y. breadth be z. new breadth be z1.then x=yzx=(1.1428y)(z1)=yzz1=1/1.1428=0.875z1-1=0.125percentage= 12.5