Ibrahim wants to buy an MP3 player for 120 euros and a CD for 19 euros. He has 55 euros in savings. His father participates in his purchase by giving him 20 euros. How much money does Ibrahim lack?
The total price of the purchases is 120 + 19 = <<120+19=139>>139 euros.
The amount of money he has after his father's help is 55 + 20 = <<55+20=75>>75 euros.
The purchase amount is 139 euros, so he is missing 139 – 75 = <<139-75=64>>64 euros.
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