There are many human and dogs in a room.one tenth of humans lost a leg.there are 77 legs.find dogs?

You have tofind number of dogs in room or:You have tofind number of dogs in roomor:Ok, so you have H humans with 1.9H legs. Then you have D dogs with

You have tofind number of dogs in room

or:You have tofind number of dogs in room

or:Ok, so you have H humans with 1.9H legs. Then you have D dogs with 4D legs. Now you write an equation.1.9H + 4D = 77 The answer must be whole numbers.77/4 = 19 and 1 remainder so you have less than 19 dogs.77/1.9 = 40.526 so you have less than 40 humans.The number of human legs can only be a multiple of 1.9: 19, 38, or 57.57/1.9 = 30 and 20/4 = 5 so you have 30 humans and 5 dogs.Now, since math is only valid when it describes reality, I suggest you ask the author of this to explain what is the point of this exercise. If it is to give you familiarity with handling numbers, that is done with a ruler. Measure things until you start to understand how a ruler works. Measure some stuff and figure out where the center is. Say you measure a book and it's 7/8\" thick. You look at your ruler and see that every eighth is divided into two sixteenths, so obviously half of 7/8\" is going to be 7/16\". If you write that out you have 1/2 x 7/8 = 7/16. And you notice that 1/2 is divided into 2/4 and then into 4/8 and so on, so you can convert anything to anything by multiplying all the numbers on top and then all the numbers on bottom.Other rulers are divided into 10 and 100 parts. But an inch is still an inch, so anything on one ruler can be translated to the other ruler. A half inch on one ruler is 5/10 or 50/100 on the other. An eighth inch is just 12.5 marks when you have 100 marks per inch. A metric ruler divides an inch into 25.4 parts, so a half inch would be 12.7 of those parts. Pretty simple, isn't it? Practice this a bit and people will think you went to wizard school.

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