Class 10MathematicsPair of Linear Equations in Two VariablesMix Examples - Pair of Linear Equations in Two Variables
MediumIn a competitive examination,one mark is awarded for each correct answer while $\frac{1}{2}$ mark is deducted for every wrong answer. Jayanti answered $120$ questions and got $90$ marks. How many questions did she answer correctly?
- A$50$
- B$75$
- C$100$
- D$155$
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Similar Questions
There are some coins of $25$ paise and some coins of $50$ paise in a box. There are in all $20$ coins and they amount to Rs. $7$. Find the number of coins of $25$ paise and $50$ paise each.
Medium
View SolutionFor a pair of equations $9x - 4y = 14$ and $7x - 3y = 11$,find the value of $y$.
Medium
View SolutionStudents of a class are made to stand in rows. If $1$ student is extra in a row,there would be $2$ rows less. If $1$ student is less in a row,there would be $3$ rows more. Find the total number of students in the class.
Difficult
View SolutionSolve the following pair of linear equations in two variables using a graph: $y = 2$,$x + 4y = 10$.
Medium
View SolutionSolve the following pairs of equations:
$4x + \frac{6}{y} = 15$
$6x - \frac{8}{y} = 14, y \neq 0$
$4x + \frac{6}{y} = 15$
$6x - \frac{8}{y} = 14, y \neq 0$
Difficult
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