The ratio of all-star baseball cards to regular baseball cards in Tony's collection is five to seven. After Tony bought four more all-star baseball cards, his all star cards make up half of his new collection. How many cards did Tony have before his new purchase?

Question

ganeshie8 · Answer

try seting up two equations and solve

ganeshie8 · Answer

say, 
all-star baseball cards = x
regular baseball cards = y

$\large \frac{x}{y} = \frac{5}{7}$ ----------------------(1)

ganeshie8 · Answer

After Tony bought four more all-star baseball cards, his all star cards make up half of his new collection.

$\large  x+4 = \frac{(x+4)+y}{2}$ ----------------(2)

ganeshie8 · Answer

two equations, two unknowns
you can solve x and y and find 'x+y'

anonymous · Answer

is it 24? :o

ganeshie8 · Answer

correct x+y = 24
good work !!

anonymous · Answer

thanks :]

ganeshie8 · Answer

np :)