4. It took Marie 10 minutes to saw a board into 2 pieces. If she works just as fast, how long will it take her to saw another board into 3 pieces?
Answer: 15
10 = 2
15 = 3 pieces
20 = 4

Ukraine company. Stocking distributor of obsolete electrical parts. Products include rectifiers, capacitors, connectors, coils, relays, chokes, resistors, switches, cables, wire, inductors, semiconductors, transistors, integrated circuits & circuit breakers.

Best wishes,

Alexander

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