Jun Wei has a total of 40 coins. An algebraic expression or equation with the given information is formed to calculate the total number of coins.
<h3>What is an algebraic expression?</h3>
An algebraic expression is the combination of one or more variables, coefficients, and constants separated by operators. Each of them is called terms of the expression.
Eg: a + 6x + 5y + 2
Here there are 4 terms with 3 variables, 3 coefficients, and one constant.
<h3>Calculation:</h3>
Given that,
Jun Wei has 12 more 10 cents coins than 20 cents coins.
So,
Consider the number of 20-cent coins = x
Then, the number of 10 cent coins = x + 12
It is given that the total value of all the coins is $5.40.
Where 1 $ = 100 cents. That implies, $5.40 = 540 cents
So,
the total value of the coins = 540 cents
⇒ 20(x) + 10(x + 12) = 540
⇒ 30x = 540 - 120
⇒ 30x = 420
∴ x = 40
Hence, there are 40 coins with Jun Wei.
Learn more about algebraic expression here:
brainly.com/question/4541471
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