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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?

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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