Question

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Answer 1

10. a) 3/7=9/x    3x=9.7   3x=63   x=63:3=21

b) x/15=12/45    45x=12.15    45x=180   x=180:45=4

c) 100/x=20/5    5x=100.20    5x=2000   x=2000:5=400

d) 24/36=x/3     36x=24.3      36x=72      x=72:36=2

11. a. 147/343; b. 414/225; c. 8775/92265; d. 520000/7200000;

12. a. 3/7; b. 46/25; c. 39/41; d. 52/750;

13. a. 20/50 simplificat cu 10=2/5

b. 250/350 simplificat cu 10=25/35 simplificat cu 5=5/7

c. 1716/4290 simplificat cu 2=858/2145

d. 72x/108x simplificat cu 4=18x/27x simplificat 9=2x/3x