Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 10 Answered

An ecologist wanted to estimate population of species of fish in a pond. he immensed a net into the pond and collected 12 fish of this species.he marked them and released all of them back into the pond . after aweek he captured 25 fish of the same species . he found 4 marked fish among these 25 fish. assume that there is no population change during the period ,estimate the number of fish of that species in the pond.
Asked by richaverma914 | 27 Jun, 2015, 06:20: PM
answered-by-expert Expert Answer
L e t space t h e space t o t a l space n u m b e r space o f space t h i s space p a r t i c u l a r space s p e c i e s space o f space f i s h space b e space x. I t space i s space g i v e n space t h a t space h e space h a d space m a r k e d space 12 space f i s h space o u t space o f space t h e space e n t i r e space p o p u l a t i o n. W h e n space h e space c a p t u r e d space 25 space f i s h space i n space t h e space n e x t space w e e k comma space h e space g o t space 4 space m a r k e d space f i s h. H e r e space w e space h a v e space t o space a s s u m e space space t h a t space t h e space r a t i o space r e m a i n s space c o n s tan t space t h r o u g h o u t space t h e space p o n d. 25 over x equals 4 over 12 therefore x equals 75. T h e space a p p r o x i m a t e space n u m b e r space o f space f i s h e s space i n space t h e space p o n d space i s space 75.
Answered by Prasenjit Paul | 29 Jun, 2015, 10:33: AM

Application Videos

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 10 - Maths
your study room is shaped like a rectangle it has a area of 28 square cm and diameter 22 cm can you tell its dimensional
Asked by yogitamanojkumar | 09 Jan, 2023, 04:01: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Meena and Seema alone can complete the whole work in (9y+3) days and 9z days, respectively and Reena and Kisan alone can complete the whole work in (2x + 2) days and (x - y) days, respectively. Reena and Chhaya together can complete the whole work in 18 days and Jaya and Payal together can complete the whole work in 24 days. Payal and Chhaya alone can complete the whole work in (10z + 2) days, and 6z days respectively. Kisan and Ira together can complete the whole work in 120/7 days and Ira and Jaya alone can complete the whole work in (x + y) days and 14z days, respectively. Find x, y and z.
Asked by nk.neetuhome | 18 Nov, 2022, 03:43: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Some student planned a picnic. The budget for the food was ₹480.as eight of them failed to join the party, the cost of the food for eachember increase by ₹10 find howany student went on the picnic
Asked by Subuhiansari67 | 28 Sep, 2022, 10:11: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Anita and Ritu together have 26 marbles. Both of them lost 3 marbles each, and the product of the number of marbles they now have is 91. Form a quadratic equation  
Asked by sakshi.ch1004 | 11 Sep, 2021, 04:32: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Find two consecutive odd positive integers,sum of whose squares is 290
Asked by ramugirija9496 | 10 Jan, 2021, 07:44: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Two water taps together can fill a tank in 9⅜ hour.the tap of larger diameter taks 10 hour less then the smaller one to fill the tank separately.find the time in which each tap can separately fill the tank. [CBSE(Delhi)2019]
Asked by rbabli091 | 13 Oct, 2020, 09:07: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
 Ruhi’s mother is 26 years older than her. The product of their ages (in years) 3 years from now will be 360. Form a Quadratic equation so as to find Ruhi’s age
Asked by arajeevshashank | 25 Jun, 2020, 07:34: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
 If I had walked 1 km/hr faster, I would have taken 15 minutes less to walk 3 km. Find the rate at which I was walking.
Asked by arajeevshashank | 25 Jun, 2020, 11:12: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
The angry arjun carried some arrows for fighting with  bheeshm with half the arrows he cut down the arrows thrown by bheeshm on him.And with six other arrows he killed the rath driver of bheeshm with arroweach he respectively knocked down the rath,flag,bow of bheeshm.finally with one more than 4 times square root of arrows he laid bheeshm unconscious on arrow bed.find the total no arrows.
Asked by arajeevshashank | 22 Jun, 2020, 09:21: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Guru was born in 1809 ad.in year x2 ad he.  was ( x  -3) years old find the value of x
Asked by arajeevshashank | 10 Jun, 2020, 06:14: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×