Let x = number of 5 cent coins.
Then there are (x+2) 10 cent coins.
Let y = 20 cent coins.
Total coins: x+(x+2)+y = 30
2x+y=28
y = 28-2x (1)
Total value: 0.05x + 0.1(x+2) + 0.2y = 3.80
0.15x + 0.2y + 0.2 = 3.80
0.15x + 0.2y = 3.60 (2)
Substitute (1) into (2).
0.15x + 0.2(28-2x) = 3.60
-0.25x + 5.60 = 3.60
2.00 = 0.25x
8 = x
From (1), obtain y = 28 - 2(8) = 12
Answer: (x+2) = 8+2 = 10
Louise has 10 10-cent coins
Answer:
The value of x is 6.66
Step-by-step explanation:
For answer refer to the attachment
<u>Related</u><u> Information</u><u> </u><u>:</u><u>-</u>
There are 4 similarity conditions,
- SAS ( side angle side )
- AAS ( angle angle side )
- SSS ( side side side )
- AAA ( angle angle angle)
180-(92+86)
Since it's a triangle the sum of all angles is 180. So 180-86-92=2