The average of a,b,c is 20 and that of b,c,d is 25, if d=30, then the value of a is-

If the sum of a number and its reciprocal be 2, then the number is-

If $$ {a^{x}={(x+y+z)^{y}}}, a^{y}=(x+y+z)^{z}  and \ a^{z}=(x+y+z)^{x}$$ then the value of (x +y +z) is

Direction: Study the following graph carefully and answer the following questions.

What is the ratio of companies having more demand than production to those having more production than demand?

A bag has Rs.420 in the denomination of Rs.1, Rs. 2 and Rs. 5 coins. The number Rs.1, Rs.2 and Rs.5 coins are in the ratio of 8: 1:5. How many coins of Rs.5 are in the bag?

Anil, Deepak, and Dinesh together can complete a work in 35 days. Anil and Dinesh together can complete the same work in 60 days. In how many days Deepak alone can complete the same work?

If Sonu is driving a car at a speed of 20m/s, then in how much time Sonu will cover a distance of 936 km?

Find the value of $$ {5^{1\over2}-[3^{1\over4}+6-4÷2]}$$