Can you please explain how you did it

205

Step-by-step explanation:

10 1/4 *20=(10*4+1)/4 *20=41*20/4=41*5=205

the rule is a b/c=(a*c+b)/c

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116

35-60 students are taking math.