Isolating Variables and Cost Calculations

The video tutorial explains how Camille, who had $18.90, bought 10 grapefruits and was left with $3.90. The task is to find the cost of one grapefruit. The instructor sets up an equation to represent the situation, isolates the variable representing the cost of one grapefruit, and solves the equation step-by-step. The final calculation reveals that each grapefruit costs $1.50.

How much money did Camille have left after buying the grapefruits?

• $3.90

• $5.00

• $10.00

• $15.00

How much did Camille initially have to spend on groceries?

• $15.00

• $10.00

• $18.90

• $3.90

What does the variable 'g' represent in the equation?

• The amount of money left

• The number of grapefruits

• The cost of one grapefruit

• The total cost of grapefruits

What is the first step in isolating the variable 'g'?

• Subtract $3.90 from both sides

• Divide both sides by 10

• Multiply both sides by 10

• Add 10g to both sides

After adding 10g to both sides, what is the next operation performed?

• Add $3.90 to both sides

• Multiply both sides by 10

• Divide both sides by 10

• Subtract $3.90 from both sides

What is the final step to find the cost of one grapefruit?

• Multiply both sides by 10

• Divide both sides by 10

• Subtract $3.90 from both sides

• Add $3.90 to both sides

What is the cost of one grapefruit?

• $0.15

• $1.50

• $15.00

• $150.00