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# Percent word problem: guavas

We're putting a little algebra to work to find the full price when you know the discount price in this percent word problem. Created by Sal Khan.

## Want to join the conversation?

• When he talks about fractions it confuses me.
• I definitely agree with you i draged this out because i was forced to
• what is a Guava?
• Guavas ae a type of fruit that can be pink or white from the inside. They have a sweet taste and a hard green skin.
• i did something slightly different that i think is good, but I didn't got the right answer. so if someone could help me, it would be really great. So this is what i did:
-too find the price of each guavas (with 30% off), i divided 12,60 by 6 and i got 2,10\$ each guava with 30% off
-Then i did 30% of 2,10\$, which gave me 0,63. So i add 2,10 with 0,63 which gave me 2,73\$. So each guava WITHOUT 30% off (full price) is equal to 2,73\$.
-Finally i did 2,73% x 2 = 5,46\$ total
BUT i didn't got the right answer and i don't know why!
if someone find my mistake and tell me where it is, i would be really grateful for them!
• The amount by which the regular price exceeds the sale price is not 30% of the sale price, but instead is 30% of the regular price!

So you can’t just add 30% of \$2.10, to \$2.10, to get a regular price of \$2.73 per guava...this is a very common type of mistake students make with this type of problem.

Instead, you would need to divide \$2.10 by 0.7 to get a regular price of \$3 per guava, since the sale price is 100%-30%=70% of the regular price.
• let x represent the price of 1 guava fruit.
6x - 6x * 0.30 = 12.60
6x - 1.8x = 12.60
4.2x = 12.60
x = 3
• Yes, you've done it perfectly. Sal did the same thing, except for the first step. He took x as the price of 6 guava fruits.
(1 vote)
• whats a guava?
• Guavas are a type of fruit that can be pink or white from the inside. They have a sweet taste and a hard green skin.
• I still don't understand how he got 0.70 by subtracting 0.30 by 1X,I believe my problem is that I didn't understand what 1X was.
• This was so confusing and no help
• The first thing that you need to do is to write the equation. So here are the steps:
1.Define the variable x :
x = cost of 6 guavas at full price.
2 We know that today, there is a 30% off on guava. So we subtract:
x - 0.3x
3. It says that the discounted price for 6 guavas is \$12.6.
So we can finish the equation:
1x - 0.30 x = 12.6
Second, we must solve the equation.
1.Simplify. We see that 1x and 0.30 x both have a x. But how to simplify? 1 of something minus 0.30 of something is 0.70 of something. So:
1x- 0.30x = 0.70x.
0.70x = 12.6
2. Get rid of the number on the left-hand side. How? We can divide. But if we divide 0.70 on the left-hand side, we must also divide 0.70 on the right-hand side.
0.70x/0.70 = 12.6/0.70
x = 18.
I hope it helps!
(PS. If you do not know why to divide the same thing on both sides, you can watch the videos about the introduction of equations.)
• This is confusing, I don't understand percentages world problems. I SO confused.
• A percent is a ratio, figure, or sum per hundred. The world problems are simply those expressed in a realistic problem. Read the question carefully, and you'll figure it out.
(1 vote)
• i suck at math 🌚🙌