20 + 60 = 40?

[LouieMacGoo]

So when I was getting my grain for my Mosquito Chaser IPA it calls for 1 lbs of Crystal 40L but the LHBS was out of 40L and suggested that I use 8 oz of Crystal 20L and 8 oz of Crystal 60L to substitute for the 40L. Without much thought I went ahead and did that but I was thinking later does that really equal 40L?

What say the Borg? Also are there other grain substitutions that you have used for grains you needed in a recipe?

[Beer-lord]

I've had this chart bookmarked for years and it's done me well the few times I needed a substitute.
http://www.brew.is/files/malt.html
The attached pdf is also very close to the link above but I think you're ok. I don't know how much base malt you have but if it's a pretty standard amount, those small amounts won't matter.
Brew, ferment, drink and repeat!

[bpgreen]

20+60 doesn't equal 40, but (20+60)/2 does. And that's really what you're doing here. You're using half as much of each to average out to 40. It's not exact, but it's close.

[mashani]

Color should be about right. Flavor might be slightly different. Does it matter really? Probably not unless your using large amounts.

[FedoraDave]

This is making my head hurt.