Leo counted on his fingers. Ratio 3:2 means for every 3 primes, 2 squares. 15 primes means 5 groups of 3. So 5 groups of 2 squares = 10 squares.
: Before you start, write down the unique code (e.g., A10) in the margin of your book. sparxmatgs
A spinning vortex of blue digits—0s and 1s, square root symbols and integral signs—opened in the center of the screen. It grew, pushing out of the monitor, until it was a swirling portal the size of a dinner plate. A metallic voice, neither male nor female, echoed from the laptop’s speakers. Leo counted on his fingers