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Word problemsArithmeticMiddle schoolabout 0:47

If 3 apples cost $1.50, how much do 7 apples cost?: animated lesson

A narrated, step-by-step word problems video lesson with captions. Final answer: 7 apples cost $3.50.

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Video with a synthetic English voice and captions. Pick another language for subtitles in that language, or open the interactive version.

Video narrated by a synthetic voice (Piper TTS, en_US-ljspeech-high voice (LJ Speech dataset, public domain)); the steps come from our maths engine and the answer was checked independently. Download MP4 (0.3 MB) · Captions (WebVTT)

Steps on screen

1. The problem
Worked example
If 3 apples cost 1.50, how much do 7 apples cost?
2. Step by step
1. Read the problem
2. Unit price
3. Scale to the new quantity
3. The answer
$\text{7 apples cost \$3.50}$
$3.50
4. Check
- $3.50 ÷ 7 = $0.50 per apple, the same unit price ✓

Transcript

The problem. Here is the problem: If 3 apples cost 1.50, how much do 7 apples cost? Proportion: 3 apples cost 1.50; find the cost of 7.

Step by step. Read the problem. 3 apples for 1.50. Unit price. 1.50 divided by 3 equals 0.50 per apple. Scale to the new quantity. 7 times 0.50 equals 3.50.

The answer. So the answer is 7 apples cost 3.50. Find the price of one unit, then multiply by the quantity you need.

Check. 3.50 divided by 7 equals 0.50 per apple, the same unit price, which checks out.

About word problems

Turn everyday situations about prices, speed, ages and interest into equations and solve them.

If 3 apples cost $1.50, how much do 7 apples cost? (Lesson)