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ML AGGARWAL CLASS 7 Chapter 9 Linear Equations and Inequalities Excercise 9.1

Excercise: 9.1Question 1(i) $\begin{aligned} 2(3-2 x) &=13 \\ 6-4 x &=13 \\-4 x &=13-6 \\-4 x &=7 \\ x=-7 / 4 \end{aligned}$ii) $\begin{aligned} \frac{3}{5} y-2=& 7 / 10 \\ \frac{3}{5} y &=7 / 10+2 \\ \frac{3}{5} y &=\frac{27}{10} \\ y &=\frac{27}{10} \times \frac{5}{3}=9 / 2 \end{aligned}$= $9 / 2$Question 2i) $\frac{x}{2}=5+x / 3$$\frac{x}{2}-\frac{x}{3}=5$$\frac{3...

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ML AGGARWAL CLASS 7 Chapter 8 Algebraic Expressions Excercise =8.1

 Excercise =8.1Question 1 (i) $3 x+6$(ii) $\quad 13-5 x$(ii) $\quad x^{2}+y^{2}$(iv) $\quad 3 p q+7$(v) $\quad x^{2}-3 x$ii) $\quad mn-(m+n)$Question 2A taxi charges = 9\kmfixed charges = 80Taxo fixed for x km is 9x + 50Question 3(i) $\quad 5 a-3 b+c$(ii. $\quad x^{2}-5 x+6 .$(iii) $x^{2} y+x y-x y^{2}$Question 4(i) $3,-7 x$ii. $2,-5 a, \frac{3}{2} b$iii, $3 x^{5}, 4 y^{3},-7 x y^{2},...

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ML AGGARWAL CLASS 7 Chapter 7 Percentage and Its Applications EXERCISE:7.1

 EXERCISE:7.1Question 1i) $25 \%=\frac{25}{100}=\frac{1}{4}$ii) $150 \%=\frac{150}{100}=\frac{3}{2}$.iii) $7 \frac{1}{2} \%=\frac{15}{2} \%=\frac{15 / 2}{100}=\frac{15}{2 \times 100}=\frac{3}{40}$iv) $33 \frac{1}{3} \%=\frac{100}{3} \%=\frac{100 / 3}{100}=\frac{100}{3 \times 100}=\frac{1}{3} .$Question 2i) $\frac{1}{8}=\left(\frac{1}{8} \times 100\right) \%=12.5 \%$ii) $\frac{5}{4}=\left(\frac{5}{4}...

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