Iknow the answer to this problem, but i don’t know how to get the
it takes you and your sister 3 hours to clean the entire house when you work together. if you can do the job alone in 4 hours, how long would it take your sister to do it by herself?

  12 hours

Step-by-step explanation:

For problems like this, it works well to think in terms of jobs per hour, rather than the given hours per job.

When you both work together, your rate is 1/3 job per hour. When you work alone, your rate is 1/4 job per hour. Then the rate increase that is contributed by your sister is the difference of these rates:

  (1/3 job/h) - (1/4 job/h) = (1/3 -1/4) job/h = 1/12 job/h

If your sister can do 1/12 of the job in 1 hour, then it takes her 12 hours to do the entire job by herself.

answer: was that a question or answer?

step-by-step explanation:

plants store their excess carbohydrate in the form of starch so that it could be used as energy source later on. the excess carbohydrate is converted into starch in the plastid i.e. chloroplast & this process occurs in the presence of sunlight. it is an insoluble polymer of glucose which gets stored in cell organelles named as amyloplasts. in some plants, starch is also stored in roots and embryos.