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Answer:
Darius is correct
Step-by-step explanation:
Darius reads of his book in 3 days
In 1 day, he reads of the book.
Therefore in 15 days, He reads
which is the whole of the book.
<u>Answer:</u>
The hand moved of a complete turn.
<u>Step-by-step explanation:</u>
The hand moved from 3 to 12, that is, it moved:
12 - 3 = 9 hours
In a clock, 12 hours represent a complete turn.
∴ Using the unitary method:
12 hours ⇒ 1 turn
1 hour ⇒ turns
9 hours ⇒ × 9 =
= turns (simplified)
∴ The hand moved of a complete turn.
Option D. 2(n + 9) is the right answer
Step-by-step explanation:
The word problems are converted into mathematical problems to solve simply.
for the given problem
"two times the sum of a number and 9"
Let n be a number then
when there is and between two things they are performed first then next operation is performed so
the sum of a number and 9
Then
two times the sum of a number and 9
Hence,
Option D. 2(n + 9) is the right answer
Keywords: Mathematical notation
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