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sergejj [24]
3 years ago
6

I have 25 coins in my pocket all of which are 5 penny or 20 penny coins. if their total value is 2.90 pounds how many penny coin

s do I have?
Mathematics
1 answer:
Jlenok [28]3 years ago
3 0

Answer:

  • 14 coins of 5p
  • 11 coins of 20p

Step-by-step explanation:

<u>Given</u>

  • 5p coins = x
  • 20p coins = y
  • Total = 2.90 = 290 p
  • Number of coins = 25

<u>Equations</u>

  • x + y = 25
  • 5x + 20y = 290 ⇒ x + 4y = 58

<u>Consider the first equation in the second one</u>

  • x + y + 3y = 58
  • 25 + 3y = 58
  • 3y = 33
  • y = 11

<u>Then x is</u>

  • x = 25 - 11 = 14

<u>Answer</u>

  • 14 off 5p coins and 11 off 20p coins
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3.528

Step-by-step explanation:

First, you need to determine the scale factor. Divide one side in the larger triangle by the corresponding side in the smaller triangle. For example, 8/2. This would give you a scale factor of 2. Then you can reverse the process with the dimensions you need to get the area. The height of the larger triangle is 3.36, so to find the height of the smaller one, you divide it by 2, or the scale factor, to get the height of the smaller triangle which is 1.68. Next, you can solve for area of triangle using a=bh/2, so 4.2*1.68/2=a = 3.528.

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<h3>Simple Interest</h3>

From the question, we are to solve for t in the given formula

The given formula is the formula for simple interest

I = Prt

To solve for t, we will divide both sides of the equation by Pr

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