Sasha spent 1/4 of her money on 18 pins and 4 keychains. The cost of 1 keychain is thrice as much as the cost of 1 pin. She bought some more keychains as much as the cost of 1 pin. She bought some more keychains with 1/2 of her remaking money. How many keychains did Sasha buy in all?
Please show us what you have done so far.
I have not done this question but this is how I would start.
Let the cost of a pin be p cents
Let the cost of a keychain by k cents
Let the entire amount of her money be M cents
Now start setting up true equations.
See if you can do something with that.