If chris and lisa went shopping and spent a total of $25.50 and lisa spent $13.50 more then chris spent. how much did lisa spend?

I think you just subtract the total - the money lisa spent

lets try it

25.50$-13.50$ = 12$

so we all know that its 12$

wanna PROVE IT , try adding 12$+13.50$ =

it will give us the total ;p

for the points! : )

on friday there were 15 birds