IBM Company Numerical Ability Alligation or Mixture

to obtain 23 liters of a production line solution that contains 10% of chemical A , sample of a solution containing 13% of chemical A and another containing 3 % of chemical A are to be mixed. how many liters of 13% sample are required a)76.67 b)6.9 c)16.1 d)6.19 e)19.58

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IBM Other Question

a software company has 850 employees of whom 81% are software engineers and 19% are sales representatives to obtain a 25% sales representative proportion how many additional employees should be added to the sales staff?
a)212
b)68
c)161
d)53
d)51
two administrative assistants were typing a 135 page report if one admin assistant typed one and 5/10 times as many pages as the other, how many pages did the more rapid admin assistant type?