Mike started with 30 cookies and gave away c cookies. Jenny started with 55 cookies and gave away double as much cookies as Mike did.
How many cookies did Jenny give away if they had the same number
of cookies?

a box 3 3/4 feet long or 4+ feet.

step-by-step explanation:

21/58.

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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