Direction : What should come in place of the question (?) in the following question.

23.56 + 134.44+ 4142.25=?

A and B together can complete a piece of work in 3 days. They start together. But, after 2 days, B left the work, if the work is completed after 2 next days. B alone could do the work in

What decimal of a week is an hour? 

Average age of 6 boys is 14 years. Average age of 11 girls is 12 years. What is the average age (in years) of all boys and girls?

A and B working together, can do a piece of work in $$ {4{1\over 2}}$$ hours. B and C working together can do it in 3 hours. C and A working together can do it in $$ {2{1\over 4}}$$ hours. All of them begin the work at the same time. Find how much time they will take to finish the piece of work?

Find the value of x:
2³ × 3⁴ × 1080 ÷ 15 = 6^x

In the figure below, O of the circle is the centre. OA = 3 cm, AC = 3 cm and OM is perpendicular to AC. So the value of ∠ABC will be

Directions:  The table given below presents the number of books on different subjects kept on separate shelves subjects with odd and even numbers are of arts and Science respectively

Find the ratio of S1: S7.