Question : The 'Red Data Book' is the documentation of endangered rare species of:

Option 1: flora

Option 2: fauna

Option 3: other living organisms

Option 4: all of these are correct

Question : Which one of the following can be categorised as a solution?

Option 1: Salt

Option 2: Diamond

Option 3: Sea Water

Option 4: Coal

Question : If $W_{1}:W_{2}= 2:3$ and $W_{1}:W_{3}= 1:2$, then $W_{2}:W_{3}$ is:

Option 1: 3 : 4

Option 2: 4 : 3

Option 3: 2 : 3

Option 4: 4 : 5

Question : If $a^2+b^2+1=2 a$, then the value of $a^4+b^7$ is:

Option 1: 1

Option 2: 0

Option 3: 2

Option 4: 4

Question : If $ (a-b):(b-c):(c-d) =1:2:3$, then what is the value of $(a + d):c$ ?

Option 1: $1:2$

Option 2: $2:1$

Option 3: $4:1$

Option 4: $3:1$