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An order for bulbs: You have space in your garden for 55 small flowering bulbs. Crocus bulbs cost \(\$ 0.35\) each and daffodil bulbs cost \(\$ 0.75\) each. Your budget allows you to spend \(\$ 25.65\) on bulbs. How many crocus bulbs and how many daffodil bulbs can you buy?

Short Answer

Expert verified
You can buy 39 crocus bulbs and 16 daffodil bulbs.

Step by step solution

01

Define Variables

Let's say the number of crocus bulbs is \( x \) and the number of daffodil bulbs is \( y \). We need to find values for \( x \) and \( y \) that satisfy all conditions of the problem.
02

Set Up Equations Based on Quantity

According to the problem, the total number of bulbs is 55. Therefore, we have the equation: \( x + y = 55 \).
03

Set Up Equations Based on Cost

Considering the costs, the total cost to buy all bulbs is \$25.65. Thus, the equation for cost is: \( 0.35x + 0.75y = 25.65 \).
04

Solve the System of Equations

Solve the two equations: 1. \( x + y = 55 \) 2. \( 0.35x + 0.75y = 25.65 \) First, solve the first equation for \( x: x = 55 - y \). Then substitute this expression into the second equation: \( 0.35(55-y) + 0.75y = 25.65 \).
05

Simplify the Equation and Solve for y

Substitute \( x = 55 - y \) into the cost equation: \( 0.35(55 - y) + 0.75y = 25.65 \) This simplifies to: \( 19.25 - 0.35y + 0.75y = 25.65 \) Simplify further: \( 19.25 + 0.4y = 25.65 \) Subtract 19.25 from both sides: \( 0.4y = 6.40 \). Finally, divide both sides by 0.4 to find \( y \): \( y = 16 \).
06

Solve for x

Now that \( y = 16 \), substitute back into \( x = 55 - y \) to find \( x \): \( x = 55 - 16 = 39 \).
07

Verify the Solution

Check that these values satisfy the cost equation:\( 0.35 \times 39 + 0.75 \times 16 = 13.65 + 12.00 = 25.65 \). Both equations are satisfied. Hence, the solution is correct.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Algebra
Algebra is a crucial branch of mathematics that deals with symbols and the rules for manipulating these symbols. In the context of our bulb problem, algebra helps us model real-life situations using equations. This involves expressing the problem in terms of variables like \( x \) and \( y \), which then allows us to solve for unknowns.

A fundamental aspect of algebra is understanding how to set up equations. In this exercise, our unknowns are the number of crocus bulbs \( x \) and the number of daffodil bulbs \( y \). We use the given information to create equations that model the problem:
  • The total number of bulbs constraint: \( x + y = 55 \)
  • The cost constraint: \( 0.35x + 0.75y = 25.65 \)
This shows how algebra translates words into mathematical symbols, making it easier to calculate precisely. Through algebra, complex word problems become solvable mathematical systems, illustrating its power in problem-solving.
Word Problems
Word problems can appear complicated because they mix words with numbers and require an understanding of what is being asked. They demand that we pull out the essential information and express it in a way that math can interpret and solve.

In this bulb example, the problem statement involves both quantities and costs, and thus presents a two-layered challenge:
  • Total space for bulbs (55 total)
  • Budget limitation (cost up to \(\( 25.65 \)\))
To tackle word problems effectively, one of the first steps is to identify the variables we need to work with. These variables are represented symbolically, like \( x \) for crocus bulbs and \( y \) for daffodil bulbs.

Once identified, interpreting the conditions of the problem into a mathematical form is crucial. Breaking down word problems into these smaller, manageable parts allows us to set up a system of equations that can then be solved logically.
Solving Equations
Solving equations is the heart of finding answers in algebraic word problems. It involves manipulating equations to find the values of unknown variables. In our bulb problem, we established a system of linear equations:
  • Equation for quantity: \( x + y = 55 \)
  • Equation for cost: \( 0.35x + 0.75y = 25.65 \)
To solve, we use a method called substitution, which involves expressing one variable in terms of another, e.g., \( x = 55 - y \). This is then substituted into the other equation, reducing the problem to one equation with one unknown.

From this point, we simplify by combining like terms and performing basic arithmetic operations to isolate \( y \). Once \( y \) is determined, we back-solve for \( x \) using our earlier expression.

Verifying the solution is always a wise step. Plugging the found values back into the original equations ensures that the math is correct and confirms the reliability of our solution.

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