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What is the difference rational and irrational numbers?

You have seven bags of gold coins. Each bag has the same number of gold coins. One day, you find a bag of 53 coins. You decide to redistribute the number of coins you have so that all eight bags you hold have the same number of coins. You successfully manage to redistribute all the coins, and you also note that you have more than 200 coins. What is the smallest number of coins you could have had before finding the bag of 53 coins?

A car collection has black cars, red cars and 7 white cars. Draw model of the car collection?

An automobile factory wants to produce a total of 210 cars during three shifts. If the first shift produces two-fifths of the cars and the second shift produce one-third of the cars, what fraction of the total cars does the third shift need to produce?

A conical tank (D=1.6 m, H=4 m) is initially full of a liquid (ρ=900 kg/m3). The top surface of this liquid is exposed to air; and rate of evaporation of the liquid is given to be proportional the exposed surface. The radius r for any level of the tank is given as: r = 0.8 - 0.00358t, where r is in meters, and t is time in hours. Determine the rate evaporation of the liquid, in kg/h, after 5 hours.