Calculate Typing Time for 84 Pages
The problem requires finding the total time needed to type 84 pages, given the time it takes to type 2 pages.
Determine Typing Rate
First, calculate the time taken per page.
- Time for 2 pages = 40 minutes
- Time per page = $\frac{\text{Time for 2 pages}}{\text{Number of pages}} = \frac{40 \text{ minutes}}{2 \text{ pages}}$
- Time per page = $20$ minutes/page
Calculate Total Time for 84 Pages
Next, use the time per page to find the total time for 84 pages.
- Time for 84 pages = Time per page $\times$ Number of pages
- Time for 84 pages = $20 \text{ minutes/page} \times 84 \text{ pages}$
- Time for 84 pages = $1680$ minutes
Therefore, the typist will take 1680 minutes to type 84 pages.
Important Questions from Ratio and proportion
A’s marks in Mathematics are directly proportional to practice time. In 6 hours of practice, A gets 70 marks. What should be the practice time (approximately) to get 90 marks?
The average of the areas of 2 similar triangles is 706.5 m2 whose perimeters are in the ratio of 6 : 11. What is 20% of the difference (in m2) in areas of both triangles?
In a triangle ABC, D and E are two points on sides AB and AC, respectively, such that DE is parallel to BC and AD : DB = 3 : 5. If AC = 5.6 cm, then find the value (in cm) of AE.
In a triangle ABC, P and Q are two points on AB and AC, respectively, such that PQ is parallel to BC. If AC = 5QC, then the ratio PQ : BC is equal to:
Find the mean proportional between 25 and 81.
