Question

Dalton was working in his chemistry lab and created a mixture whose weight is

contributed by 90% water and 10% carbon. The weight of the mixture is 20

pounds. As he just finished creating the mixture. Dalton needs to go urgently

for some urgent work for 2 days. When he returned, the weight of water in the

mixture was reduced from 90% to 50%. How much does the mixture weigh

now?


b) We have two identical balls in terms of diameter and weight. However, one of

them is solid and the other is hollow. Without knocking the ball, can you find

the solid ball?


c) There are four gears with the following specification:

Gear A has 60 teeth, Gear B has 40 teeth, Gear C has 20 teeth, Gear D has 60

teeth, every minute Gear B makes 15 complete turns. What is the relative

speed of Gear A and Gear B?



d) A man is trapped on a frozen lake in an isolated region. The frozen surface is

frictionless and no grip of any kind can be attained over it. He just has a mobile

phone in his pocket but when he takes it out to call for help, he finds out that

there is no reception. There is no wind force that may help him in escaping.

What will he do to escape the lake and save himself from freezing to death?


e) You cannot see me, I cannot be touched, you cannot feel me, but I can cook

your lunch, Find out what am I?​

Answer 1

Answer:

nswer & ExplanationSolution:

4 Pounds

Explanation

90% of water = 18 pounds

10% of carbon = 2 pounds

Now,

Earlier 10% of carbon is now contributing 50% weight = 2pound

Therefore weight of water is also contributing 50% weight = 2 pounds

Explanation:

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