Algebra Word Problems

Examples on Algebra Word Problems

1) The three angles in a triangle are in the ratio of 2:3:4. Find the measure of each angle.

Solution :
Let the ratio = x

As in the triangle, sum of all the three angles = 180⁰

2x + 3x + 4x = 180

9x = 180

X = 20

Each angle,

2x = 2( 20) = 40⁰

3x = 3(20) = 60⁰

4x = 4(20) = 80⁰
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2) The sum of 3 consecutive even numbers is 78. Find the numbers.

Solution :
Let the 3 consecutive even numbers are x, x+2 and x+4.

Therefore,

x + (x + 2) + (x + 4) = 78

Or 3x + 6 = 78

Or 3x = 78 – 6 = 72

Or x = 24 (Divide both sides by 3)

So the three numbers are 24,26,18.
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3) There are 650 students in a school. If the number of girls is 106 more than the boys, how many boys are there in the school?

Solution :
Let the number of boys = x

Then, number of girls = x + 106

x + (x + 106) = 650 (Given in the question)

Or 2x + 106 = 650

Or 2x = 650 – 106 = 544

Or x = 272

Hence, the number of boys = 272

And, the number of girls = (x + 106)

= 272 + 106

= 378
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4) I have a total of $300 in coins of denomination $1, $2 and $5. The number of $2 coins is 3 times the number of $5 coins. The total number of coins is 160. How many coins of each denomination are with me?

Solution
Let $5 coin = x
∴ $2 coins = 3x
Total number of coins = 160
So, $1 coin = 160 - (x +3x)= 160 -4x
Total money = $300
∴ 5(x) + 2(3x) + 1(160 -4x)=300
⇒ 5x + 6x + 160 - 4x = 300
⇒ 11x -4x + 160 =300
⇒ 7x + 160 =300
⇒ 7x = 300 -160
⇒ 7x = 140
So, $5 coins are 20
$2 coins = 3x = 3(20)=60
$1 coins = 160 -(20 + 60)
$1 coins = 80
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Linear Equation in One Variable

• Linear Equation in One Variable
• Algebraic Equations with Fractions
• Algebra Word Problems
• Algebra Rate (upstream and downstream) Problems
• Algebra Age Problems
• Algebra Digit Problems

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