science chapter1 chemical reactions and equation ka notes write Karna hai
Answers
Answer:
Science is a subject that explains how the world around us is made of. Chemical reactions are used to explain the various processes that happen around us. From rust to decomposition, chemical reactions provide a more in-depth insight into how molecular interaction and changes occur. In other words, chapter 1 of CBSE class 10 Science explains how a substance changes form.
Answer:
Let x and y be the present age of mother and her daughter.
Therefore,
x+y=50
⇒x=50−y.....(1)
After 20 years, mother's age will be twice her daughter's age at the time.
x+20=2(y+20)
⇒x−2y=20.....(2)
From equation (1)&(2), we have
50−y−2y=20
3y=30
⇒y=10
Substituting the value of y in equation (1), we get
x=50−10=40
Hence the present age of mother and her daughter is 40 and 10 years respectively
Explanation:
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