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Byju's Answer
Standard IV
Mathematics
Fractions
If the total ...
Question
If the total working hours are
22
7
hours,
then calculate the number of hours spent in assembling.
A
5
7
h
r
s
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B
3
7
h
r
s
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C
2
7
h
r
s
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D
4
7
h
r
s
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Solution
The correct option is
A
5
7
h
r
s
First of all, let's convert the mixed fraction to improper fraction with denominator 7.
1
2
7
= 1 +
2
7
=
7
7
+
2
7
=
9
7
Time taken in stamping =
4
7
h
r
s
Time taken in welding =
1
7
h
r
s
Time taken in painting =
9
7
h
r
s
Time taken in inspection =
3
7
h
r
s
Total time taken =
22
7
h
r
s
Time taken in assembling will be:
⇒
22
7
−
4
+
1
+
9
+
3
7
⇒
22
7
−
17
7
⇒
22
−
17
7
⇒
5
7
h
r
s
Hence,
5
7
hours are taken in assembling.
Marking the points on a line plot:
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