JAMB Mathematics 2021 Objective — Question 40

Question 40 of 40 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2021 Objective paper, with the correct answer and a full explanation.

40. If 6 gallons of spirit containing 20% water are added to 10 gallons of another spirit containing 15% water, what percentage of the mixture is water? (a) 33¾% (b) 4⅓% (c) 16⅞% (d) 8 7/16%

A. 33¾%
B. 4⅓%
C. 16⅞%Correct
D. 8 7/16%

Explanation

Water in first mixture = 20% × 6 = 1.2 gallons. Water in second mixture = 15% × 10 = 1.5 gallons. Total water = 2.7 gallons out of 16 gallons total. % water = 2.7/16 × 100% = 16⅞%.

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