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
Solve 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
View SolutionSolve the following pair of equations by the method of cross multiplication:
$x + y - (a + b) = 0$
$ax - by - (a^2 - b^2) = 0$
$x + y - (a + b) = 0$
$ax - by - (a^2 - b^2) = 0$
Difficult
View SolutionFind the values of $x$ and $y$ in the following rectangle.
Medium
View SolutionIn a two-digit number,the digit at unit's place is $x$ and the digit at ten's place is $y$. The number obtained by interchanging the digits is ...........
Easy
View SolutionThe ages of two girls are in the ratio $5:7$. Eight years ago,their ages were in the ratio $7:13$. Represent this situation as a pair of linear equations in two variables.
Medium
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