Invitations

For every 5 minutes, writes Dana had ten invitations, while Anna had 14 invitations. How long will write together 120 invitations?

Correct answer:

t =  25 min

Step-by-step explanation:


10/5 ·t + 14/5 · t = 120

24t = 600


t = 600/24 = 25

t = 25

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