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Ah, problem solving is like painting a beautiful landscape. First, you identify the problem, then gather information about it. Next, you brainstorm possible solutions and choose the best one. After that, you create a plan and take action to solve the problem. Finally, you evaluate the results and make any necessary adjustments. Just like adding happy little trees to a painting, each step builds upon the last to create a masterpiece of problem solving.
You're being conned! To travel a total of 20 km at 80 kph would take 15 min. You've already taken 15 min to cover 10 km at 40 kph.
X is the most famous variable in algebra, and a variable is a letter that stands for a number. It is used for you to apply methods of problem solving to get the answer, and the answer will be what x stands for. For example, if you see the problem 48-2x=100, you know you have to solve for x. The next step would be to subtract 48 from both ends of the equation, so you get (48-2x) -48= (100) -48 ---> -2x=52. Then you divide each side by -2 to get x by itself ---> -2x/2=52/-2 ---> x= -26. So you can see that x is not one specific number, it is just a variable.