Mrs. Deepa Devi saves 30% of her salary. If she receives Rs.42,000 per month as her salary, what is her monthly expenditure?

A, B and C entered into a business and their investment ratio was 5 : 4 : 3. After 4 months B invested Rs. 1000 more and after 8 months C invested Rs. 2000 more. At the end of one year the profit ratio was 15 : 14 : 11, then the investment of C at the beginning was -  

A and B started a business with investments Rs 3500 and Rs 2500 respectively. After 4 months C joined with Rs 6000. If the difference between C's share and B's share in the annual profit was Rs 1977, what was the total annual profit? 

What approximate value should come at place of the question mark(?) in the following question?

Study the following pie-diagrams carefully and answer the question given below it.
PERCENTAGE COMPOSITION OF HUMAN BODY 

 In the human body, what part is made of neither bones nor skin?

In the given figure, AB, AE, EF, FG and GB are semicircles. AB=56 cm and AE=EF=FG=GB. What is the area (in cm²) of the shaded region?

One boy from a group of eight boys left and a new boy with a weight of 56 kg joined the group, which resulted in an average weight of 2.5 kg has increased, what is the weight of the new boy?