I was done with math homework,
It had taken real long,
When I heard a soft singing,
And it was singing this song!
Happy birthday to you,
Happy birthday again,
I’ll steal a few numbers,
To celebrate 10…

I spun around fast,
And looked through my eyes,
And the sight that I saw,
Was no birthday surprise…

If my math homework had taken 70 minutes,
and each problem took 10 minutes to solve,
how many problems had there been?