Approximately how long will it take to produce the fifth through tenth units?
A)15 hours
B)16 hours
C)18 hours
D)20 hours
E)21 hours

Question

Quizplus · Accepted Answer

According to the information given in the question, the first unit requires 5 hours and each subsequent unit requires an additional hour to produce. Therefore, the second unit requires 6 hours, third unit requires 7 hours, fourth unit requires 8 hours, fifth unit requires 9 hours, sixth unit requires 10 hours and seventh unit requires 11 hours. Adding up the time required to produce these units: 5+6+7+8+9+10+11= 56 hours. To find the time required to produce the fifth through tenth units, we subtract the time required for the fourth unit from the time required for the tenth unit: 55-8 = 47. So, the time required to produce the fifth through tenth units is 47 hours. Hence, the correct answer is D (20 hours).

Approximately How Long Will It Take to Produce the Fifth