Hi, kindly help me please.
3) Alice, Betty and Christina have some cookies each. If Alice gives 4 cookies to Betty, both of them will have an equal number of cookies. If Betty gives 4 cookies to Alice, Alice will have thrice as many cookies as Betty. Christina's share is the sum of the other two girls share. How many cookies do the three girls have altogether?
4) Martin and Leo have some marbles each. If Martin gives Leo 24 marbles, they will have an equal number of marbles. If Martin gives Leo 56 marbles, Martin will have 1/3 as many marbles as Leo. How many marbles does Martin have at first?
5) If Ismail buys 3 packets of biscuits and 4 packets of seaweed, he will have $4.50 left, if he buys 3 packets of seaweed and 4 packets of biscuits, he will have $3.50 left. Given that a packet of seaweed costs $6, find the amount of money he have at first.