What approximate value should come in the place of (?) in the following questions.

(59.99 * 2.99) + 455.12 - ? = 280.12

What approximate value should come in the place of (?) in the following questions.

(? + 120.12) * 2 + 40% of 999.99 = 1200.12

A mixture contains milk and water in the ratio of 16:9. After 250 ml of the mixture is taken out, 40 ml of milk and 10 ml of water are added to the remaining mixture. The ratio of milk to water then becomes 2:1. Find the initial quantity of milk in the mixture.

A bought a cycle for Rs.x and he sold it to B at a profit of y% and B sold it to C at a loss of 20%. If B paid Rs.3600 and C paid Rs.(x – 120) for the cycle, then find the value of y?

B and C entered into a business by investing Rs. (x + 300) and Rs. 800, respectively. B and C invested for 8 months and 10 months, respectively. If the ratio of the profit share of B to C is 9:10, find the value of x.

Two cars, A and B, are at Delhi and Mumbai, respectively, which are 810 km apart. Both cars start their journey at 10:00 am. They meet at 2:48 pm, and car B reaches Delhi at 11:30 pm on the same day. Approximately how many hours will it take for car A to reach Mumbai?

The difference between the simple interest and compound interest on a certain sum at the rate of 25% per annum after 2 years is Rs.250. Find the simple interest, if he invested the same amount at the rate of 10% per annum for 3 years.

A boat covers 240 km downstream in 8 hours and the boat covers d km in still water in 5 hours. If the ratio of the speed of the boat to the speed of the stream is 11:4, then find the value of d.

A box contains 25 red balls, 16 blue balls and 19 green balls. If four balls are drawn at random from the box, then find the probability of getting two red balls, one blue ball and one green ball?

The ratio of the present age of A to B is 9:11 and after 5 years, the ratio of the age of A to B is 5:6. If the present age of C is 20% more than that of B and the ratio of the present age of C to D is 3:4, find the present age of D.