Q1. The length and breadth of a rectangle are increased by 20% and 10% respectively. Which of the following cannot be the percentage increase in its perimeter? Q2. A wheel with rubber has an outside diameter of 25 inches. When the radius has been decreased by a quarter of an inch, the number of revolutions of the wheel in one mile will be Q3. “A” made 3 mistakes in an examination(no negative marking) where all questions carry equal marks, and obtained 72%. If he had attempted 6 more questions and made 4 wrongs, he would have had 82%. How many questions were there in exam? Q4. what is the effective increase/decrease of a number if it is alternatively increased and then decreased in the following sequence Q5. If the area of a square is increased by 100%, then the percentage increase in the length of its diagonal is Q6. In a factory there are 3 types of machine M1, M2 and M3. which produces 25%, 35% and 40% of the total products respectively. If M1, M2 and M3 produces 2%, 4% and 5% defective respectively. What is the percentage non-defective products? Q7. A’s weight is 140% of C’s weight. B’s weight is 90% of S’s weight. S weighs twice as much as Chari. What percentage of A’s weight is B’s weight? Q8. The profit percentage made by arun in selling a toothpaste is numerically equal to its cost price(in Rs.). If he sold it for Rs. 31.25, find its cost price in (Rs.) |
|||
|
|
 |
Q7. A’s weight is 140% of C’s weight. B’s weight is 90% of S’s weight. S weighs twice as much as Chari. What percentage of A’s weight is B’s weight?
a. 64.3% b. 77.8% c. 90% d. 128.6%
A's Weight=1.40C's weight
B=0.90S
S=2C
Now A=1.4C
=1.40(S/2)
=1.40(1/2)(B/0.9)= (7/9)B=77.78%B
Little Star
n/a
Q8. The profit percentage made by arun in selling a toothpaste is numerically equal to its cost price(in Rs.). If he sold it for Rs. 31.25, find its cost price in (Rs.)
a. 20 b. 25 c. 22 d. 28
sold price=31.25
cost price=x
so (x/100)=(31.25-x)/x
so x^2+100x-3125=0
so x=25
Litte Star
n/a
Q4. what is the effective increase/decrease of a number if it is alternatively increased and then decreased in the following sequence
10% increase, 20% decrease, 30% increase and 40% decrease.
if the orignal value=x
then final vale=1.1*.8*1.3*.6x=0.6864x
so decrease=31.36%
Little Star
n/a
Q6. In a factory there are 3 types of machine M1, M2 and M3. which produces 25%, 35% and 40% of the total products respectively. If M1, M2 and M3 produces 2%, 4% and 5% defective respectively. What is the percentage non-defective products?
a. 89% b. 97.1% c. 96.1% d. 86.1%
total non-defactive products=(.25*.98x+.35*.96x+.35*.95x)/100=96.1%
Little Star
n/a
Q5. If the area of a square is increased by 100%, then the percentage increase in the length of its diagonal is
a. 10% b. 41.4% c. 50% d. 55.5%
ans=41.4%
Little Star
n/a
Q2. A wheel with rubber has an outside diameter of 25 inches. When the radius has been decreased by a quarter of an inch, the number of revolutions of the wheel in one mile will be
a. increase by about 2%
b. increase by about 30%
c. increase by about 20%
d. increase by about 0.2%
Ans is (A)
Little Star
n/a
Post new comment