Choose the word which is least like the other words in the group?

If '+' means x, `-' means ÷, 'x' means + and '÷' means — ; compute the value of the expression: 15 + 9 x 10 + 5

Consider the given statements to be true and decide which of the conclusions logically follow(s) from the statements.
Statements:
Students passing from premier institutions such as IIM, IIT and IISC get placed in foreign countries and receive more salary than they received in India.
Conclusions:
1. Companies in India should pay the same salary as companies in foreign countries.
2. Students from these institutions should be barred from going to foreign countries.

If the number 1 on the clock is replaced by the letter ‘M’, the number 2 is replaced by ‘N’
and so on, then when thetime is 21:00 p.m. the hour hand will be at .......... letter.

Find the similarity in the following:
Carbon, Silicon, Boron, Arsenic