It will take the student 75 minutes to solve 50 problems.
- A student solve 20 problems in 30 minutes
- How long it will take him to solve 50 problems is Unknown.
Further Explanation
We are going use the cross multiplication method to solve this question
20 problems = 30 minutes
50 problems = X (let x represent the minutes)
Therefore, if you cross multiply, you have:
20 × X = 50 × 30
20X = 1500 (divide both sides by 20)
= 20x / 20 = 1500/20 (20 will cross out 20)
X = 1500 / 20 (how many times can 20 goes in 1500)
X = 75
Therefore, it will take the 75 minutes to solve 50 problems.
Using Cross multiplication method, you multiply the numerator of the left fraction by the denominator of the right fraction and also multiply the numerator of the right fraction by the numerator of the left fraction.
Also, the derived products (two products) must be set equal to each other and then you can solve for the variables.
LEARN MORE:
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KEYWORDS:
- cross multiplication
- 50 problems
- 20 problems
- 30 minutes
- denominator
- numerator
