Advertisements
Advertisements
प्रश्न
A group of 21 students paid ₹ 840 as the entry fee for a magic show. How many students entered the magic show if the total amount paid was ₹ 1680?
Advertisements
उत्तर
Let the required number of students be x.
| Number of students | 21 | x |
| Entry fees in ₹ | 840 | 1680 |
As the number of students increases the entry fees also increases.
∴ They are in direct proportion.
∴ `(x_1)/(y_1) = (x_2)/(y_2)`
`21/840 = x/1680`
x = `(21 xx 1680)/840`
x = 42.
∴ The number of students entered magic show = 42
APPEARS IN
संबंधित प्रश्न
A mixture of paint is prepared by mixing 1 part of red pigments with 8 parts of base. In the following table, find the parts of the base that need to be added.
| Parts of red pigment | 1 | 4 | 7 | 12 | 20 |
| parts of base | 8 | .... | .... | .... | .... |
Rohit bought 12 registers for Rs 156, find the cost of 7 such registers.
Anupama takes 125 minutes in walking a distance of 100 metre. What distance would she cover in 315 minutes?
A worker is paid Rs 210 for 6 days work. If his total income of the month is Rs 875, for how many days did he work?
The amount of extension in an elastic spring varies directly with the weight hung on it. If a weight of 250 gm produces an extension of 3.5 cm, find the extension produced by the weight of 700 gm.
In 15 days, the earth picks up 1.2 × 108 kg of dust from the atmosphere. In how many days it will pick up 4.8 × 108 kg of dust?
l varies directly as m and l is equal to 5, when `m = 2/3`. Find l when `m = 16/3`.
44 cows can graze a field in 9 days. How many less/more cows will graze the same field in 12 days?
A recipe for a particular type of muffins requires 1 cup of milk and 1.5 cups of chocolates. Riya has 7.5 cups of chocolates. If she is using the recipe as a guide, how many cups of milk will she need to prepare muffins?
Kusum always forgets how to convert miles to kilometres and back again. However she remembers that her car’s speedometer shows both miles and kilometres. She knows that travelling 50 miles per hour is same as travelling 80 kilometres per hour. To cover a distance of 200 km, how many miles Kusum would have to go?
