Advertisements
Advertisements
प्रश्न
The ratio of the pocket money saved by a boy and his sister is 5:4. If the brother saves Rs 100 more, how much more should the sister save in order to keep the ratio of their savings unchanged ?
Advertisements
उत्तर
Let money saved by the boy and her sister be Sx and 4x and let the sister need to save Rs y more
`(5"x" + 100)/(4"x" + "y") = 5/4`
⇒ 20x + 400 = 20x + 5y
⇒ 5y = 400
⇒ y = 80
The sister needs to save Rs 80 more.
APPEARS IN
संबंधित प्रश्न
A school has 630 students. The ratio of the number of boys to the number of girls is 3 : 2. This ratio changes to 7 : 5 after the admission of 90 new students. Find the number of newly admitted boys.
Find duplicate ratio of 3 : 4
Find triplicate ratio of `m/2 : n/3`
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.
The present age of two persons are in the ratio 4: 3. Nine years hence their ages will be in the ratio 23: 18. Find their present ages.
If b is the mean proportion between a and c, show that:
`("a"^4 + "a"^2"b"^2 + "b"^4)/("b"^4 + "b"^2"c"^2 +"c"^4) = "a"^2/"c"^2`
A rail journey of 75 km costs Rs 215. How much will a journey of 120 km cost?
|
Distance from Mary’s home to school (in km.)
|
10 | 4 | |||
|
Distance from John’s home to school (in km.)
|
5 | 4 | 3 | 1 |
If a bus travels 160 km in 4 hours and a train travels 320 km in 5 hours at uniform speeds, then the ratio of the distances travelled by them in one hour is ______.
Present age of father is 42 years and that of his son is 14 years. Find the ratio of age of the father to the age of son, when son was 12 years old.
