What does a duck do when it flies upside down? The answer to this riddle is hidden in the equation given below:
If i + 69 = 70, then i = ? If 8u = 6u + 8, then u = ?
If 4a = –5a + 45, then a = ? if 4q + 5 = 17, then q = ?
If –5t – 60 = – 70, then t = ? If 
s + 98 = 100, then s = ?
If 
p + 9 = 24, then p = _____?
If 3c = c + 12, then c = _____?
If 3 (k + 1) = 24, then k = _____?
For riddle answer: substitute the number for the letter it equals
We have, i + 69 = 70
⇒ i = 70 – 69
⇒ i = 1
and 8u = 6u + 8
⇒ 8u – 6u = 8
⇒ 2u = 8
⇒ 
[dividing both side by 2]
⇒ u = 4
We have, 4a = –5a + 45
⇒ 4a + 5a = 45
⇒ 9a = 45
⇒ 
[dividing both side by 9]
⇒ a = 5
and 4q + 5 = 17
⇒ 4q = 17 – 5
⇒ 4q = 12
⇒ 
[dividing both side by 4]
⇒ q = 3
We have, –5t – 60 = –70
⇒ –5t = –70 + 60
⇒ –5t = –10
⇒ 
[dividing both side by –5]
⇒ t = 2
and 
⇒ 
⇒ 
⇒ 5p = 15 × 3
⇒ 5p = 45
⇒ 
[dividing both side by 5]
⇒ p = 9
We have, 3c = c + 12
⇒ 3c – c = 12
⇒ 2c = 12
⇒ 
⇒ c = 6
We have, 3(k + 1) = 24
⇒ 
[dividing both side by 3]
⇒ k + 1 = 8
⇒ k = 8 – 1
⇒ k = 7
By substituting the number for the letter, it equals, we get
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