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 5m long and 9m broad. It has one door measuring 2m by 1.5m and two windows each measuring 1m by 1m. The cost of painting the walls of the room at the rate of BD90 per m2 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?