Find the area of a trapezium whose parallel sides are of length 15 cm and 20 cm, respectively, and whose distance between the parallel sides is 12 cm.
A can do a piece of work alone in 12 days. B is 20% more efficient than A, and C is 25% more efficient than B. In how many days can B and C together complete the work?
\(\dfrac{35}{9}\text{ days}\)
\(\dfrac{40}{9}\text{ days}\)
\(\dfrac{35}{7}\text{ days}\)
\(\dfrac{40}{7}\text{ days}\)
The value of
is: