Five students are seated in a circle. each student has either a red disc or a green disc painted on
her forehead. each student can see the other four discs, but not her own. if a student is wearing a green disc, any state she makes is true; if she is wearing a red disc, any statement she makes is
false.
student 1 says: i see 3 green and 1 red discs
student 2 says: i see 4 red discs
student 3 says: i see 1 green and 3 red discs
students 4 say: it is raining outside
student 5 says: i see 4 green discs
which students have green discs and which students have red discs?

Students 3 and 4 have green discs.  Students 1, 2, and 5 have red discs.

Step-by-step explanation:

If Student 1 is telling the truth, Students 2 and 3 must be lying.  If that were true, Student 1 would see at least 2 red discs, not 1.  So Student 1 is lying, and therefore has a red disc.

Therefore, Student 5 is also lying, and must also have a red disc.

If Student 2 is telling the truth, the other four students must be lying.  That means Student 2 would have a green disc, and the other four would have red discs.  But if that were true, then Student 3 would be telling the truth.  Therefore, Student 2 is lying.

So far, we know Students 1, 2, and 5 are lying.  If Student 3 is telling the truth, then she and Student 4 each have a green disc.  If Student 3 is lying, then all five students would have red discs, which would mean Student 2 was telling the truth.

Therefore, Students 3 and 4 have green discs.  Students 1, 2, and 5 have red discs.

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.

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!