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Thinking process: - Samy had 4/5 of what Tim had. So we can suppose Samy had 4 units. - Samy used 1/3 of his money. So perhaps it is better to use 3 x 4 units. Working: Samy Tim Start 12u 15u Food 4u 10u Remain 5u 4u: Since Samy spent 1/3 of 12u to pay for food. 10u: Since 4u is 2/7 of food cost, so it cost 14u. Tim paid 10u. 5u: That means 5u = $10 and u = $2. The meal cost 14u = $28.