Advertisements
Advertisements
प्रश्न
Three times a number added to 8 gives 20. Find the number.
उत्तर
Let the required number be x.
Three times this number is 3x.
On adding 8, the number becomes 3x + 8.
3x + 8 = 20
or, 3x + 8 − 8 = 20 − 8 [Subtracting 8 from both the sides]
or, 3x = 12
or, `(3x)/3=12/3` [Dividing both the sides by 3]
or, x = 4
∴ Required number = 4
APPEARS IN
संबंधित प्रश्न
Complete the last column of the table.
| Equation | Value | Say, whether the Equation is Satisfied. (Yes/No) |
| x + 3 = 0 | x = 0 |
Check whether the value given in the bracket is a solution to the given equation or not:
4p − 3 = 13 (p = − 4)
Set up an equation in the following case:
Irfan says that he has 7 marbles more than five times the marbles Parmit has. Irfan has 37 marbles. (Take m to be the number of Parmit’s marbles.)
Verify by substitution that the root of \[\frac{z}{7} = 8\]
The cost of 1 pen is Rs 16 and the cost of 1 pencil is Rs 5. What is the total cost of x pens and y pencils?
Solve: 3(x + 2) − 2(x − 1) = 7.
Fill in the blank.
An expression having two-term is called a______
Write the following statement in the form of the equation:
One-fourth of m is 3 more than 7.
Change the following statements using expressions into statements in ordinary language.
(For example, Given Salim scores r runs in a cricket match, Nalin scores (r + 15) runs. In ordinary language − Nalin scores 15 runs more than Salim.)
Our class has n students. The school has 20 n students.
Complete the table and by inspection of the table, find the solution to the equation 5t = 35.
|
t |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
______ |
|
5t |
______ |
______ |
______ |
______ |
______ |
______ |
______ |
______ |
______ |
______ |
