The occupations of biomedical engineers skin care specialists and physician assistants are among the 10 with the largest growth from 2008 to 2018. the number of physician assistant jobs will grow 1 thousand less than 3 times the number of biomedical engineer jobs. the number of skin care specialist jobs will grow 13 thousand more than half the number of biomedical engineer jobs. if the total growth of these three jobs is predicted to be 57 thousand find the predicted growth of each job.

Let the number of biomedical engineers be b, the number of skin care specialists be s, and the number of physician assistants be p.

Given that the number of physician assistant jobs will grow 1 thousand less than 3 times the number of biomedical engineer jobs. This implies
3b - p = 1,000 - - - - - - - - (1)

Given that the number of skin care specialist jobs will grow 13 thousand more than half the number of biomedical engineer jobs. This implies
- - - - - - - - (2)

Given that the total growth of these three jobs is predicted to be 57 thousand. This implies that
b + s + p = 57,000 - - - - - - - - (3)

We solve the three equations simultaneously as follows:
From (1): p = 3b - 1,000 - - - - - - - - (4)
From (2): - - - - - - - - (5)

Putting (4) and (5) into (3), we have


From (4): p = 3(10,000) - 1,000 = 30,000 - 1,000 = 29,000
From (5):

Therefore, the growth of biomedical engineers is 10,000.
The growth of skin care specialists is 29,000, and
The growth of physician assistants is 18,000.

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Planet earth has a mass of 5.9726x10²⁴ kg.then: 5.9726x10²⁴ kg=100% of the total earth mass.if the water´s mass=5x10-4 % of the total mass, we can solve this problem by the rule of three.5.9726x10²⁴ %*10⁻⁴ %x=(5.9726x10²³ kg)(5*10⁻⁴  %) / 100 %=2.9863x10¹⁹ kganswer:   the mass of the planet´s water would be   2.9863 x 10¹⁹ kg.