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Byju's Answer
Standard VII
Mathematics
Integers
Find the valu...
Question
Find the value of 'x'. [3 MARKS]
(i)
4
x
+
5
=
25
(ii)
x
−
2
1
3
=
5
1
2
(iii)
(
7
x
+
8
)
÷
7
=
8
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Solution
Each Option: 1 Mark
(i)
4
x
+
5
=
25
⇒
4
x
=
25
−
5
⇒
4
x
=
20
Divide by 4 on both sides,
4
x
÷
4
=
20
÷
4
x
=
5
(ii)
x
−
2
1
3
=
5
1
2
⇒
x
−
7
3
=
11
2
⇒
3
x
−
7
3
=
11
2
⇒
3
x
=
11
2
×
3
+
7
⇒
3
x
=
33
+
14
2
=
47
2
⇒
x
=
47
6
=
7
5
6
=
7.833
(iii)
(
7
x
+
8
)
÷
7
=
8
⇒
7
x
+
8
7
=
8
⇒
7
x
=
8
×
7
−
8
=
56
−
8
=
48
⇒
x
=
48
7
=
6
6
7
=
6.86
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0
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