Neco 2018 Geography Question 49
Practice objective / multiple choice question 49 from the 2018 Neco Geography examination.
An earth‑science student collects a 150‑kg rock sample that consists of granite, basalt and limestone. The total silica (\(SiO_{2}\)) content of the sample is 55 % by weight. Granite contains 70 % silica, basalt 45 % silica and limestone 5 % silica. If the mass of limestone in the sample is twice the mass of basalt, calculate the mass of basalt (in kg) in the sample, correct to one decimal place.
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About This Question
This is Neco 2018 Geography Question 49. It is one of the objective questions from the 2018 Neco Geography examination.
Difficulty level: Medium .
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