If the number in the center is the sum of all other numbers, find the value of a. (Clarification: In the figure, the terms containing a are products of a with single digit numbers.)
A shopkeeper provides two successive discount of 10% and 30% on selling an article. If the selling price is BD504, find the marked price of the article.
A room is ^@5 \space m^@ long and ^@9 \space m^@ broad. It has one door measuring ^@2 \space m^@ by ^@1.5 \space m^@ and two windows each measuring ^@1 \space m^@ by ^@1 \space m^@. The cost of painting the walls of the room at the rate of ^@BD90^@ per ^@m^2^@ is ^@BD29880^@. Find the height of the room.
There are few taps and holes in tank. Each tap can fill empty tank in 28 minutes, while each hole can empty a full tank in 35 minutes. If there are 3 taps and 2 holes, how long would it take to fill empty tank?
The graph shows the temperature forecast and the actual temperature of a city for ten days. Find the maximum deviation of actual temperature from the forecast.
A box contains 6 orange and 3 green balls. Juma takes out a ball, puts it back, and then takes out another ball. What is the probability that both balls were orange?