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HELP 7 TIME POSTING PLZ

In the proof of the triangle angle sum theorem, you must draw an auxiliary line. which construction must you use to draw this line?

In a box lenght 1m breadth 60 cm and height 40 cm small rectangular packets of dimension 5 cm into 8 cm into 10 cm are packed. how many such small packets can be packed in the big box?

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers