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vfiekz [6]
3 years ago
6

A coin sorting machine can sort a certain number of coins in 15 min a second machine can sort the same number of coins in 30 min

how long would it take both machines working together to do the job?
plz give all the steps that will be marked as the Branilest!!!!!!!!!!!!!!!!!!!!!!!!
Mathematics
1 answer:
padilas [110]3 years ago
7 0

Answer:

10 minutes

Step-by-step explanation:

Let's use the variable x for the amount of coins.

The first machine can sort x coins in 15 minutes, so its speed is x/15 coins/minute.

The second machine can sort x coins in 30 minutes, so its speed is x/30 coins/minute.

If we sum the speeds, we have that the speed will be:

speed = (x/15) + (x/30) = (2x + x)/30 = 3x/30 = x/10

The total speed can sort x/10 coins per minute, that is x coins in 10 minutes.

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The sales price of an LCD TV is $280, representing 30% off the regular price. What is the original price?
musickatia [10]

Answer:

$400

Step-by-step explanation:

Let 'p' represent the original price, the 'p-0.3p' represents the sale price:

280 = p - 0.3p .

Solving for 'p' we have p=400.

The original price of the television was $400

4 0
3 years ago
Can someone solve Pythagorean theorem​
Ad libitum [116K]

Answer:

48 units

b= 48 units

Step-by-step explanation:

pythag is a^2+b^2=c^2

we have a and c

so substitute them in

14^2+b^2=50^2

now you can solve

196+b^2=2500

subtract 196 from both sides

b^2=2500-196

subtract

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therefore b= 48 units

5 0
2 years ago
The greatest common factor of 30.48.60
Elena-2011 [213]
30= 3*10
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60= 3*20
60= 3*10*2
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The GCF is 3*2 because all 3 numbers contain a 3 and a 2 in their prime factorizations.

Final answer: 6
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Step-by-step explanation:

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