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RSB [31]
3 years ago
11

Please help easy A) 30/40 B)22/40 C)18/40 D)10/40

Mathematics
2 answers:
LekaFEV [45]3 years ago
8 0

Answer:

D

Step-by-step explanation:

Fiesta28 [93]3 years ago
3 0
The answer is D MARK ME BRAINLY
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3 years ago
12. The weight of 56<br>books is 8kg. What<br>is the weight of 154<br>such books?​
Korvikt [17]

Answer:

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Step-by-step explanation:

5 0
3 years ago
The price of books are $180 but he uses a 30% discount but there is a 4% tax what is the total price?
Anna [14]

well, so the book is 180 and is discounted by 30%, how much will that be?

\begin{array}{|c|ll} \cline{1-1} \textit{a\% of b}\\ \cline{1-1} \\ \left( \cfrac{a}{100} \right)\cdot b \\\\ \cline{1-1} \end{array}~\hspace{5em}\stackrel{\textit{30\% of 180}}{\left( \cfrac{30}{100} \right)180}\implies 54\qquad \qquad \underset{\textit{discounted price}}{\stackrel{180-54}{126}}

so from that discounted price, a tax of 4%

\begin{array}{|c|ll} \cline{1-1} \textit{a\% of b}\\ \cline{1-1} \\ \left( \cfrac{a}{100} \right)\cdot b \\\\ \cline{1-1} \end{array}~\hspace{5em}\stackrel{\textit{4\% of 126}}{\left( \cfrac{4}{100} \right)126}\implies 5.04\qquad \qquad \underset{\textit{final price}}{\stackrel{126+5.04}{131.04}}

5 0
3 years ago
There are 4 swimmers in a race. There will be a first place, a second place, and third-place prize award. In how many different
malfutka [58]
Let's assume there's a fourth place too, and fourth place is the one where it's no prize.

4 3 2 1 (4 3 X X)
4 3 1 2 (^ but 3rd and 4th digit exchanged)
4 2 3 1 (4 2 X X)
4 2 1 3 etc.,.
4 1 2 3
4 1 3 2

As you can see, there are six possibilities assuming first swimmer was fourth.
Now, there would be six possibilities if the first swimmer was third, and same goes for second and first.
Thus, 6 x 4 = 24, there are 24 possibilities to award the 3 prizes (plus 1 no-prize)

Simple Mathematical Way:
4 x 3 x 2 x 1 = 4! = 24
There are 24 ways.
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