Answer:
Step-by-step explanation:
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18/20=9/10 9*10=90%
use the fraction or decimal then multiply by 100 or ten depending
No they are not
scientific notation requires writing the ' × 10^9' part as a 10 with an exponent
I like to use 8 hours of school a day so thats 21 a week but all people are different so at most 36 hours a week
Answer: The age of the twins is 10 years.
Step-by-step explanation:
Suppose the age of older sister be x
Let the age of twins sister be x-9, as they are born after 9 years.
Product of their ages be

Sum of their ages will be

According to question,

So, Age of older sister will be 19 years.
Age of the twins will be

Hence, the age of the twins is 10 years.