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Byju's Answer
Standard VII
Mathematics
Triangular Numbers Using Patterns
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Question
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If 35% of a number added to 39 is the number itself, the number is
(a) 60
(b) 65
(c) 75
(d) 105
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Solution
(a) 60
Let x be the number.
According to question, we have:
(35% of x ) + 39 = x
⇒
35
100
×
x
+
39
=
x
⇒
7
x
20
+
39
=
x
⇒
x
-
7
x
20
=
39
⇒
20
x
-
7
x
20
=
39
⇒
13
x
20
=
39
∴ x =
39
×
20
13
= 60
Hence, the required number is 60
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Q.
If 35% of a number added to 39 is the number itself, the number is
(a) 60
(b) 65
(c) 75
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Q.
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In the given figure, CE || BA and EF || CD. If
∠BAC = 40°, ∠ACB = 65° and ∠CEF = x° then the value of x is
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Figure
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