Got stumped in the following DS questions.
: Need some detail explanation:
foodcalories per kg|Grams of protein per KG
S 2000 150
T |1500 90
The table above gives the number of calories and grams of protein per
kilogram of foods S and T. If a total of 7 kilograms of S and T are combined
to make a certain food mixture, how many kilograms of food S are in the
(1) The mixture has a total of 12,000
(2) The mixture has a total of 810
grams of protein.
2> S is a set of integers such that
i) if a is in S, then a is in S, and
ii) if each of a and b is in S, then ab is in S.
Is 4 in S?
(1) 1 is in S.
(2) 2 is in S.
Answer will be posted afterwards.