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mars1129 [50]
2 years ago
9

a parking meter accepts only 20p coins or 50p coins.On one day, 39 coins were collected with a total value of $11.40. find how m

any 50p coins were collected.​
Mathematics
2 answers:
Snowcat [4.5K]2 years ago
6 0

Answer:

x + Y = 39 or x = 39-y

20x + 50y = 1.40

20 (39 - y) + 50y = 11.40

7.80 - 20y + 50y = 11.40

30y = 11.40 - 7.80

30y = 3.60

y = 3.60/30

y = 12 50p coins were collected.

x = 39 - 12 = 27 20p coins were collected.

Proof:

20*27 + 50*12 = 11.40

5.40 + 6 = 11.40

11.40 = 11.40

I hope it helps.

alina1380 [7]2 years ago
3 0

Answer:

  12 50p coins were collected

Step-by-step explanation:

Let x represent the number of 50p coins. Then 39-x is the number of 20p coins. The total value of coins collected was ...

  20(39-x) +50(x) = 1140

  780 +30x = 1140 . . . . . . . simplify

  30x = 360 . . . . . . . . subtract 780

  x = 12 . . . . . . . . . divide by 30

12 of the 50p coins were collected.

__

39 -12 = 27 of the 20p coins were collected.

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3 0
3 years ago
Ajay bought a fan and a heater for rs 4000. He sold the fan at a profit of a 25% and the heater at a loss of 5%. If he gained 7%
Alborosie

Answer: Heater -Rs 2400; Fan- Rs 1600

Step-by-step explanation:

Given

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8 0
3 years ago
1/3 of a number is 12 less than the number itself
natulia [17]
Let "x" be a substitute for "a number"

1/3(x)=x-12    Multiply by 3
x=3x-36         Get n onto the same side of the equation
2x=36            Divide by 2
x=18

That's your answer.
5 0
3 years ago
CAN SOMEONE PLZ HELP
FinnZ [79.3K]

Answer:

File will help, im sure

Step-by-step explanation:

<em><u>Plz mark as brainliest if correct! Have a nice day!!! </u></em>

<em><u>-Lil G</u></em>

4 0
3 years ago
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