Chris bought 5 identical packets of biscuits. She opened one packet and ate 3 biscuits. She then had 82 biscuits left.
Which expression shows how to work out the number of biscuits in a complete packets?
a) 82+3)/5
b) (82-3)/5
c)83+3/5
d)82-3 /5

Question

Chris bought 5 identical packets of biscuits. She opened one packet and ate 3 biscuits. She then had 82 biscuits left.
Which expression shows how to work out the number of biscuits in a complete packets?
a) 82+3)/5 
b) (82-3)/5 
c)83+3/5 
d)82-3 /5

anonymous · Answer

She bought 5 packets, let's call the number of biscuits in each packet x. She starts out with 5x biscuits. She eats 3 and has 82 left. From this we see that 5x - 3 = 82. Solve for x

anonymous · Answer

Do you know how to do so?

anonymous · Answer

no,cant really figure it out

anonymous · Answer

You try to get the variables on one side of the equation and the constants on the other.

anonymous · Answer

Think of 5x-3 as the "variable side" and 82 as the "constant side". To get all the constants to the constant side, add three to both of the sides, so that we get 5x = 82 +3

anonymous · Answer

Then to solve for x, we divide both sides by 5

anonymous · Answer

We thereby get (82+3)/5

anonymous · Answer

yep i understand, thank u!

anonymous · Answer

No problem :) Need help with anything else?