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## Algebra: Basics Test-1

Congratulations - you have completed Algebra: Basics Test-1.You scored %%SCORE%% out of %%TOTAL%%.You correct answer percentage: %%PERCENTAGE%% .Your performance has been rated as %%RATING%%
 Question 1
If aĂ— b = 2a-3b+ab, then 3 Ă— 5 +5 x 3 is equal to:
 A 20 B 23 C 24 D 22
Question 1 Explanation:
We are given by the statement that
$\displaystyle \begin{array}{l}a\times b=2a-3b+ab\\\Rightarrow 3\times 5=2\times 3-3\times 5+3\times 5=6\\5\times 3=2\times 5-3\times 3+3\times 5\\=10-9+15=16\\\therefore \,\,3\times 5+5\times 3=6+16=22\end{array}$
 Question 2
If p Ă—q = p Ă— q + p/q , the value of 8 Ă—2 are:
 A 13 B 14 C 15 D 16
Question 2 Explanation:
$\displaystyle \begin{array}{l}p\,\,\times \,q=p+q+\frac{p}{q}\\\therefore 8\times 2=8+2+\frac{8}{2}\\=10+4=14\end{array}$
 Question 3
Two numbers a and b ( a > b) are such that their sum is equal to three times their difference.Then value of $\displaystyle \frac{3ab}{2\left( {{a}^{2}}-{{b}^{2}} \right)}$Â will be:
 A $\displaystyle 1\frac{1}{2}$ B $\displaystyle 1\frac{2}{3}$ C $\displaystyle 1\frac{1}{3}$ D 1
Question 3 Explanation:
From the given statement we can say that
$\displaystyle \begin{array}{l}\left( a+b \right)=3\left( a-b \right)=3a-3b\\\Rightarrow 3b+b=3a-ra\\\Rightarrow 2a=4b\\\Rightarrow a=2b\\\Rightarrow \frac{a}{b}=\frac{2}{1}\\\Rightarrow \frac{a}{b}=\frac{1}{2}\\\therefore \,a=2,\,b=1\\\frac{3ab}{2\left( {{a}^{2}}-{{b}^{2}} \right)}=\frac{3\times 2\times 1}{2\times \left( 4-1 \right)}=\frac{6}{6}=1\end{array}$
 Question 4
The value of <br> $\displaystyle \left( 1+\frac{1}{p} \right)\left( 1\frac{1}{p+1} \right)\left( 1+\frac{1}{p+2} \right)\left( 1+\frac{1}{p+3} \right)$
is
 A $\displaystyle 1+\frac{1}{p+4}$ B $\displaystyle p+4$ C $\displaystyle \frac{p+4}{p}$ D $\displaystyle \frac{1}{p}$
Question 4 Explanation:
We can solve the given fraction as
$\displaystyle \begin{array}{l}=\left( 1+\frac{1}{p} \right)\left( 1+\frac{1}{p+1} \right)\left( 1+\frac{1}{p+2} \right)\left( 1+\frac{1}{p+3} \right)\\=\frac{p+1}{p}\times \frac{p+2}{p+1}\times \frac{p+3}{p+2}\times \frac{p+4}{p+3}\\=\frac{p+4}{p}\end{array}$
 Question 5
If a Ă— b = 2 (a + b), then 5 Ă—2 is equal to:
 A 16 B 12 C 14 D 18
Question 5 Explanation:
Given statement is
$\displaystyle \begin{array}{l}a\times b=2\left( a+b \right)\\\therefore \,5\times 2=2\left( 5+2 \right)\,\,\\=2\times 7=14\end{array}$
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