Question

What does a duck do when it flies upside down?
The answer to this riddle is hidden in the equation given below:
If $i+69=70,\text{then}i=?$
If $8u=6u+8,\text{then}u=?$
If $4a=-5a+45,\text{then}a=?$
If $4q+5=17,\text{then}q=?$
If $-5t-60=-70,\text{then}t=?$
If $\frac{1}{4}s+98=100,\text{then}s=?$
If $\frac{5}{3}p+9=24,\text{then}p=?$
If $3c=c+12,\text{then}c=?$
If $3(k+1)=24,\text{then}k=?$
For riddle answer: substitute the number for the letter it equals.

Answer 1

Step 1: Find the value of each letter​
Given: $i+69=70$
$\Rightarrow i=70-69=1$

Given: $8u=6u+8$
$\Rightarrow 2u=8$
$\Rightarrow u=\frac{8}{2}=4$

Given: $4a=-5a+45$
$\Rightarrow 9a=45$
$\Rightarrow a=\frac{45}{9}=5$

Given: $4q+5=17$
$\Rightarrow 4q=17-5=12$
$\Rightarrow q=\frac{12}{4}=3$

Given: $-5t-60=-70$
$\Rightarrow -5t=-70+60=-10$
$\Rightarrow t=\frac{-10}{-5}=2$

Given: $\frac{1}{4}s+98=100$
$\Rightarrow \frac{1}{4}s=2$
$\Rightarrow s=8$

Given: $\frac{5}{3}p+9=24$
$\Rightarrow \frac{5}{3}p=24-9=15$
$p=\frac{15\times 3}{5}=9$

Given: $3c=c+12$
$\Rightarrow 2c=12$
$c=\frac{12}{2}=6$

Given: $3(k+1)=24$
$\Rightarrow k+1=\frac{24}{3}=8$
$\Rightarrow k=8-1=7$

Hence the values are:
$i=1,u=4,a=5,q=3,c=6,r=8,p=9,c=6,k=7$

Step 2: Substitute the values​