CTET Solved Paper - UTET September 2013 Paper2
- Option : D
- Explanation : (D) In 30 L of mixture, milk is 21 L and water is 9 L. Let x L of water needs to be added.
⇒ 147 = 27 + 3x
⇒ 120= 3x
⇒ x = 40L
- Option : C
- Explanation : (C) Let the two consecutive even number be x and (x + 2).
According to the question.
(x + 2)2- x2 = 84
x2 + 4 + 4x - x2 = 84
4x = 80 => x = 20
So, the sum is 20 + 22 = 42
88. The sum of first 35 odd natural numbers is
- Option : A
- Explanation : (A) The sum of first 35 odd natural numbers
[sum of first natural numbers = n2]
= (35)2 = 1225
90. Chemical formula of Plaster of Paris is
- Option : B
- Explanation : (B) Plaster of Paris is made from gypsum which is a crystalline mineral of hydrated calcium sulphate. The chemical formula of plaster of Paris is
CaSO4. 1/2H2O
