Q. 1054.8( 5 Votes )

# 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

Answer :

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

Rate this question :

150 has been divided into two parts such that twice the first part is equal to the second part. Find the parts.

NCERT - Exemplar MathematicsAnamika thought of a number. She multiplied it by 2, added 5 to the product and obtained 17 as the result. What is the number she had thought of?

NCERT - Exemplar MathematicsAfter 25 years, Rama will be 5 times as old as he is now. Find his present age.

NCERT - Exemplar MathematicsFill in the blanks to make the statements true.

If then x = ________.

NCERT - Exemplar MathematicsThe sum of three consecutive integers is 5 more than the smallest of the integers. Find the integers.

NCERT - Exemplar MathematicsSolve the following riddle:

I am a number,

Tell my identity!

Take me seven times over

And add a fifty!

To reach a triple century

You still need forty!

NCERT MathematicsExpress each of the given statements as an equation.

Mohan is 3 years older than Sohan. The sum of their ages is 43 years.

NCERT - Exemplar MathematicsSeven times a number is 12 less than thirteen times the same number. Find the number.

NCERT - Exemplar Mathematics