## Double Sunglasses

"Double Sunglasses" by Dan Meyer CC BY-NC 3.0

What percent tint will there be when he puts on both pairs of sunglasses?

Write down a guess you think is too small.

Write down a guess you think is too big.

Now calculate what you think the correct answer is.

Can he reach 100% tint this way?

How many pairs of 50% tint sunglasses would it take?

Write down a guess you think is too small.

Write down a guess you think is too big.

Now calculate what you think the correct answer is.

Can he reach 100% tint this way?

How many pairs of 50% tint sunglasses would it take?