Which insect species is the primary producer of silk

Which two signs should be interchanged to make the given equation correct?

125 × 5 + 2 ÷ 37 – 35 = 64

Select the one which is different from the other three responses.

Select the one which is different from the other three responses.

What is the difference between the floor numbers of X and Y?

How many 5's are there followed by 3 but not preceded by 7?

7 5 3 1 6 8 5 8 4 3 5 3 7 1 6 1 5 8 6 4 5 3 2 5

Number of letter skipped between adjacent letters in the series decreased by one. Find out the series that is in this sequence?

Choose the figure which is different from the rest.

Select the one which is different from the other three responses.

Four of the following five figures are alike in a certain way and thus form a group. Which is the one that does NOT belong to that group?