A biologist noticed that the population of lady bugs in a sample doubled in every $3$ days. The population of lady bugs at the end of $12$ days was $480$ . What was initial population-of ladybugs? .

160

No worries! We‘ve got your back. Try BYJU‘S free classes today!

80

No worries! We‘ve got your back. Try BYJU‘S free classes today!

60

No worries! We‘ve got your back. Try BYJU‘S free classes today!

30

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct option is C $30$
Let the population in the beginning = $x$
Population after 3 days = $2 x$
Population after 6 days = $4 x$
Population after 9 days = $8 x$
Population after 12 days = $16 x$
Thus, $16 x = 480$
$x = 30$

Suggest Corrections

Similar questions

Q. A given population of bugs inhabiting a habitat X consisted of 200 bugs at the beginning of the year. Throughout the year there were 75 bugs born and 90 bugs that died. Around 35 bugs from a neighbouring habitat entered this population of habitat X in the middle of the year and started living with the original population. 15 bugs left the population by the end of the year to find a new habitat. What is the final size of the population living in habitat X at the end of the year?

The population of a city doubles in every 10 years. If the initial population was \frac{3}{20} million, calculate the population after 30 years .

Q. Assertion :In a regular medical examination of a small population, a 35 years old lady was found to have higher levels of oestrogen and progesterone in her blood. Reason: The lady is 12 weeks pregnant.

Q. The population of a certain town increases by

50

percent every

50

years. If the population in

1950

was

810

, in what year was the population

160

Q. A statement of assertion is followed by a statement of reason.

Assertion: In a regular medical examination of a small population, a 35 years old lady was found to have higher levels of oestrogens, progesterone in her blood.
Reason: The lady is 12 weeks pregnant.

Mark the correct choice as:

Join BYJU'S Learning Program

A biologist noticed that the population of lady bugs in a sample doubled in every 3 days. The population of lady bugs at the end of 12 days was 480. What was initial population-of ladybugs? .

The correct option is C 30Let the population in the beginning = xPopulation after 3 days = 2xPopulation after 6 days = 4xPopulation after 9 days =8xPopulation after 12 days = 16xThus, 16x=480x=30

A biologist noticed that the population of lady bugs in a sample doubled in every $3$ days. The population of lady bugs at the end of $12$ days was $480$ . What was initial population-of ladybugs? .

The correct option is C $30$
Let the population in the beginning = $x$
Population after 3 days = $2 x$
Population after 6 days = $4 x$
Population after 9 days = $8 x$
Population after 12 days = $16 x$
Thus, $16 x = 480$
$x = 30$