Advertisements
Advertisements
प्रश्न
A postman can sort out 738 letters in 6 hours. How many letters can be sorted in 9 hours?
Advertisements
उत्तर
Let the required number of letters be x.
| Number of letters | 738 | x |
| Required time to sort in hours | 6 | 9 |
They are in direct proportion.
`(x_1)/(y_1) = (x_2)/(y_2)`
`738/6 = x/9`
x = `(739 xx 9)/6`
x = 1107
In 9 hours 1107 letters can be sorted.
APPEARS IN
संबंधित प्रश्न
A photograph of a bacteria enlarged 50,000 times attains a length of 5 cm as shown in the diagram. What is the actual length of the bacteria? If the photograph is enlarged 20,000 times only, what would be its enlarged length?
Fill in the blank in of the following so as to make the statement true:
x and y are said to vary directly with each other if for some positive number k ....,...... = k.
A cistern can be filled by one tap in 8 hours, and by another in 4 hours. How long will it take to fill the cistern if both taps are opened together?
A cistern has two inlets A and B which can fill it in 12 hours and 15 hours respectively. An outlet can empty the full cistern in 10 hours. If all the three pipes are opened together in the empty cistern, how much time will they take to fill the cistern completely?
Expenditure of a family to number of members of the family are in direct proportion
If two quantities x and y vary directly with each other, then ______
The area of cultivated land and the crop harvested is a case of direct proportion.
There are 20 grams of protein in 75 grams of sauted fish. How many grams of protein is in 225 gm of that fish?
A water tank casts a shadow 21 m long. A tree of height 9.5 m casts a shadow 8 m long at the same time. The lengths of the shadows are directly proportional to their heights. Find the height of the tank.
Many schools have a recommended students-teacher ratio as 35:1. Next year, school expects an increase in enrolment by 280 students. How many new teachers will they have to appoint to maintain the students-teacher ratio?
