**Asked in Elitmus**

# Elitmus previous questions

2. A mixture of 125 gallons of wine and water contains 20% of water. How much water must be added to the mixture in order to increase the percentage of water to 25% of the new mixture?

a) 10 gallons

b) 8.5gallons

c) 8gallons

d) 8.33gallons

3. Side of a square is 10 cm. after joining the mid point of all sides makes a another inner square and this process goes to infinite.Find the sum of perimeter of all squares.

What will be the percentage profit of selling one liter milk.?

1) 16 liter of milk is sold at cost price after adding 20% water to it.

2) the cost price of one liter milk is Rs.16.

5. y=x/(x-k),where k is a constant,and x is real number.show that.

1.y increase with increase in x.

2.y decreases first and then increase with the value of x.

3.y increase then decrease with the value of x.

4.it remains constant.

6. What is the maximum value of vx – yz. If the value of v,x,y,z have to be chosen from the set A where A(-3,-2,-1,0,1,2,3)

a) 9

b) 12

c) 15

d) none of these

7. Given a Number 123456, from this number put any three values in numerator and remaining three are in denominator. So how many values you can make from this number less than 1/5.

1. 2

2. 4

3. 8

4.27

8. A square was given. Inside the square there are white tiles and black tiles. Black tiles was among the diagonal of the square and dimensions of both white as well as black tiles is 1cm x 1cm. If there are 81 black tiles in the square. Then find the no of white tiles in it.