Advertisements
Advertisements
प्रश्न
The work done by (x – 3) men in (2x + 1) days and the work done by (2x + 1) men in (x + 4) days are in the ratio of 3: 10. Find the value of x.
उत्तर
(x - 3) men do a work in (2x + 1) day
∴ 1 man does it in (2x + 1) (x - 3) days
(2x + 1) men do a work in (x + 4) days
∴ 1 man does it in (x + 4) (2x + 1) days
∴ `((2x + 1) (x - 3))/((x + 4) (2x + 1)) = (3)/(10)`
`(x - 3)/(x + 4) = (3)/(10)`
10x - 30 = 3x + 12
10 -3x = 12 + 30
7x = 42
x = `(42)/(7)`
x = 6.
APPEARS IN
संबंधित प्रश्न
If A : B = 2 : 5 and A : C = 3 : 4, find: A : B : C.
A man's monthly inoome is Rs 5,000. He saves every month a minimum of R~ 800. Find the ratio of his:
monthly savings to monthly expenses.
Two positive numbers are in the ratio 3: 4 and the sum of their squares is 1225. Find the numbers.
If A : B = 3 : 5 and B : C = 4 : 7, find A : B : C
Rohit goes to school by car at 60 km per hour and Manoj goes to school by scooty at 40 km per hour. If they both live in the same locality, find the ratio between the time taken by Rohit and Manoj to reach school.
A hostel is to be built for schoolgoing girls. Two toilets are to be built for every 15 girls. If 75 girls will be living in the hostel, how many toilets will be required in this proportion?
Find the simplified form of the following ratio.
32 : 24
Which pair of ratios are equal? And why?
`4/5, 12/50`
In the given figure, the comparative areas of the continents are given: What is the ratio of the areas of
(a) Africa to Europe
(b) Australia to Asia
(c) Antarctica to Combined area of North America and South America.
225% is equal to ______.
