• A. 16a = 40b
• B. 40a = 16b
• C. ab = 40 ´ 16
• D. ab = 640

Answer: Option B

Explanation:

• A. 19
• B. 20
• C. 21
• D. 22

Answer: Option D

Explanation:

• A. $a^2-b^2=\left(a+b\right)\left(a-b\right)$
• B. $a^2+b^2={\left(a+b\right)}^2 -2ab$
• C. $a^2+b^2={\left(a-b\right)}^2 +2ab$
• D. ${\left(a+b\right)}^2={\left(a-b\right)}^2 +4ab$

Answer: Option C

Explanation:

• A. ± 3 m
• B. -3m
• C. +3m
• D. 6m

Answer: Option A

Explanation:

• A. 10
• B. 9
• C. 2
• D. -9

Answer: Option B

Explanation:

• A. $x-5$
• B. $x-6$
• C. $x^2+x+3$
• D. $x^2-x+3$

Answer: Option A

Explanation:

• A. $1$
• B. $2^{n+1 }$
• C. $3$
• D. $2^n$

Answer: Option B

Explanation:

• A. 8
• B. 9
• C. 10
• D. 12

Answer: Option B

Explanation:

• A. 8
• B. 12
• C. 10
• D. 15

Answer: Option B

Explanation:

• A. x = c, y = a
• B. x = c, y = -a
• C. x = -c, y = a
• D. x = a, y = c

Answer: Option A

Explanation:

• A. ৮ কিমি
• B. ১০ কিমি
• C. ১২ কিমি
• D. ১১ কিমি

Answer: Option B

Explanation:

• A. $\frac{\sqrt{3}}{2}{m}^2$
• B. $\frac{\sqrt{3}}{4}{m}^2$
• C. $\frac{3}{2}m$
• D. $\frac{2}{\sqrt{3}}{m}^2$

Answer: Option B

Explanation:

• A. 800
• B. 8
• C. 9
• D. 72

Answer: Option C

Explanation:

• A. $১৬\frac{১}{৪}\%$
• B. $১৬\frac{২}{৩}\%$
• C. $৬\frac{২}{৩}\%$
• D. $৬\frac{১}{২}\%$

Answer: Option B

Explanation:

• A. $৬\frac{১}{২}\%$
• B. $৪\frac{১}{২}\%$
• C. $৬\frac{১}{৪}\%$
• D. $৪\frac{১}{৩}\%$

Answer: Option C

Explanation: