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RRB Assistant Loco Pilot and Technician Model Paper 7 with solutions
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© examsnet.com
Question : 5
Total: 100
The average weight of a class of 15 boys and 10 girls is 38.4 kg. If the average weight of the boys is 40 kg, then what is the average weight of the girls?
36.5 kg
35 kg
36 kg
34.6 kg
Validate
Solution:
(c) Let average weight of girls = x
Total weight of the boys = 40 kg × 15 = 600 kg.
Average weight of a class
=
Total
weight
of
girls
+
Total
weight
of
boys
No
.
of
boys
+
No
.
of
girls
⇒ 38.4 =
600
+
10
×
x
15
+
10
⇒ 38.4 =
600
+
10
x
25
⇒ 38.4 × 25 = 600 + 10x
∴ x = 36 kg
© examsnet.com
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