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emmasim [6.3K]
2 years ago
13

P P,Q and R can finish a task in 8, 10 and 12 hours respectivly.They started working together but after 3 hours, P and R left. H

ow long will Q take to finish the task now?​
Detail it
Mathematics
1 answer:
zimovet [89]2 years ago
7 0

Answer:

45 minutes

Step-by-step explanation:

Assume task completed in total x hours

\frac{x}{10} + \frac{3}{8} + \frac{3}{12} = 1 \\ 12x + 45 + 30 = 120 \\ 12x = 45 \\ x = \frac{15}{4} = 3 \frac{3}{4}

So q will take 45 more minutes

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vovikov84 [41]

Answer:

First blank- 4x

Second blank- combine

Third blank- X

Hope this helps :3

(Write feedback if incorrect)

6 0
3 years ago
Andrew is two years older than Beatrice, and Chris is three years younger than Beatrice.
In-s [12.5K]

Answer:

Beatrice's age is 34

Step-by-step explanation:

Beatruce = B

Andrew = B+2

Chris= B-3

B+(B+2) +(B-3 )= 67-B

3B-1 = 67-B

2B -1 = 67

2B= 68

B = 34

Beatrice is 34

Andrew is 36   (34+2)

Chris is 31 (34-3)

36+31 = 67

6 0
2 years ago
An airplane covers 3450 km in an hour. how much distance will it cover in 7 hours?
umka2103 [35]

Answer:

24,150km

Step-by-step explanation:

The plane travels 3450km in 1 hr, since we need the distance traveled in 7 hrs we need to multiply 3450 by 7.

distance in 7hrs: 3450*7 = 24,150km

4 0
2 years ago
Consider the infinite region bounded by the curves y=1/x, x=1, and the x-axis. Show that the solid obtained by rotating this reg
solmaris [256]
Can you j the question more sorry i just cant find the comment so i used this.
5 0
3 years ago
In order to qualify for the tournament, basketball teams have to win at least 70% of their games. This season, the Bears lost 6
stealth61 [152]
The bears won 9 games.
15-6=9
Hope this helped
3 0
3 years ago
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