Free postage

Dad found out that when ordering goods over the Internet and will pay more than 60 euros do not pay a fee for postal delivery.
He chose goods for 10, 20 and 15 euros. How many euros do we have pay for goods for free postage?

Correct result:

x =  15 Eur

Solution:

x=60−10−20−15=15 Eurx=60-10-20-15=15 \ \text{Eur}

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