Madiha thinks of a number. She multiplied it by 6.2 and added 8 to the produc
she got the answer 39. Find the number.
Answers
Answer:
To solve practical problems:
(A) Read the problem carefully and denote the unknown quantity
by variable x, y etc.
(i) Form the equation according to the given conditions.
(ii) Solve the equation i.e., find the value of the unknown
quantity (variable).
In Examples 1 to 3, there are four options, out of which one is correct.
Choose the correct one.
Example 1: The solution of the equation 3x + 5 = 0 is
(a)
5
3 (b) – 5 (c) - 5
3 (d) 5
Solution : Correct answer is (c).
Example 2: –1 is not a solution of the equation
(a) x + 1 = 0 (b) x – 1 = 2 (c) 2y + 3 =1 (d) 2p + 7 = 5
Solution : Correct answer is (b).
Example 3: Which of the following equations can be formed using
the expression x = 5:
(a) 2x + 3 = 13 (b) 3x + 2 = 13
(c) x – 5 = 1 (d) 4x – 9 =21
Solution: Correct answer is (a).
[Hint: x = 5 on multiplying both sides by 2 gives 2x = 10
which on adding 3 both sides gives 2x + 3 =13]