Lizzy: Samanta is planning a party for her friend Marta. She decided to raise some money among the guests she invited, to buy Marta a gift. Every participant gave Samanta $5 for this purpose and she herself put in $10. The gift cost was lower than expected, so there was $15 leftover. What was the price of the gift, if there were 12 guests invited?.
Me: Hmmm, let me think. I think this is the detailed solution:
From all the guests Samanta got $5 / guest * 12 guests = $60. Including money Samanta put herself, she had $60 + $10 = $70. The cost of the gift was $70 - $15 = $55. Final answer: 55.