Question
Abi and Diana have some marbles. If Abi gives 13 marbles to Diana, Diana will have 4 times the number of marbles as Abi. If Diana gives 20 marbles to Abi, Abi will have 25 as many marbles as Diana. How many marbles does Abi have at first?
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Abi and Diana have some marbles. If Abi gives 13 marbles to Diana, Diana will have 4 times the number of marbles as Abi. If Diana gives 20 marbles to Abi, Abi will have 25 as many marbles as Diana. How many marbles does Abi have at first?