Percent word problem example 1 | Ratios, rates, and percentages | 6th grade | Khan Academy

TL;DR

Learn how to calculate the full price of guavas when a discount is applied and determine the cost of guavas at full price using algebra.

Transcript

Let's say I go to the fruit store today and they have a sale on guavas. Everything is 30% off. This is for guavas. And it's only today. Only today. So I say, you know what, let me go buy a bunch of guavas. So I go and I buy 6 guavas. So I buy six guavas. And it ends up, when I go to the register, and we're assuming no tax, it's a grocery and I live... Read More

Key Insights

• 🔇 The speaker purchases 6 guavas at a sale price, which is 30% off the full price.
• ❓ Algebraic equations can be used to calculate the full price of the guavas.
• 🗂️ Dividing the sale price by 0.7 gives the full price of the guavas.

Questions & Answers

Q: How much did the speaker pay for 6 guavas during the sale?

The speaker paid $12.60 for 6 guavas during the sale, which was 30% off the full price.

Q: What is the full price of 6 guavas?

The full price of 6 guavas is $18, obtained by dividing $12.60 (the sale price) by 0.7 (which represents 70% of the full price).

Q: How can the cost of 2 guavas at full price be calculated?

Since the full price of 6 guavas is $18, the cost of one guava at full price is $3. Therefore, 2 guavas at full price would cost $6.

Q: How can algebra be used to determine the full price of guavas?

Algebra can be used to solve the equation representing the discount given on the sale price. By dividing the sale price by 0.7, the full price of guavas can be found.

Summary & Key Takeaways

• The speaker goes to a fruit store and buys 6 guavas at a sale price of $12.60, which is 30% off the full price.

• The next day, the sale is over, and the speaker wants to buy 2 more guavas. The cost of these guavas at full price needs to be determined.

• Using algebra, it is found that the full price of 6 guavas is $18, or $3 per guava. Therefore, the cost of 2 guavas at full price is $6.