(Sample Material) CSAT Online Coaching : Basic Numeracy "Average"

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Subject: Basic Numeracy

Topic: Average

1. Jitu scores 60, 80, 40, 50 and 90 per cent marks in the subjects A, B, C, D and E respectively. However, the weights attached to those subjects are 5, 4, 3, 2 and 1 respectively. Which of the following represents the weighted average of marks scored by Jitu in these five subjects

(a) 75
(b) 78
(c) 62
(d) 79

2. In a journey of 160 km, a train covers the distance 120 km at a speed of 80 km/h and the remaining distance at 40 km/h. The average speed of the train for the whole journey is:

(a) 50 km/h
(b) 64 km/h
(c) 68 km/h
(d) 74 km/h

3. The average of 10 numbers is 7. If each number is multiplied by 12, then the average of new set of numbers is

(a) 72
(b) 86
(c) 79
(d) 84

4. The ratio between the present ages of M and N is 5 : 3 respectively. The ratio between M’s age 4 years ago and N’s age after 4 years is 1 : 1. What is the ratio between M’s age after 4 years and N’s age 4 years ago?

(a) 6 : 1
(b) 3 : 1
(c) 4 : 1
(d) 4 : 5

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