# Solve the equations: (the % is X.) a) 15•%=120 b) 126: b=18 v) at: 13=78 Calculate choosing a convenient operations procedure: a) 4·689 · 25. b) 125·963 · 8 c) 60·31 · 50 Solve a problem with the help of the equation: "Olya conceived number, increased it by 6 and to the work added 7. As a result she received 97. What number did she conceive? " Guess b+b-35=b+20 equation root

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A) 15*X=120 X=120:15 X=8 of Answer: x =8 b) 126: b=18 b=18*26 b=468 of Answer: b=468 v) y: 13=78 y=178*13 y=2314 of Answer: y=2314 a) 4*689*25=4*25*689=100*689=68900 b) 125*963*8=125*8*963=1000*963=963000 c) 60*31*50=60*50*31=3000*31=93000 x*6+7=97 x*6=97-7 x*6=90 x=90:6 x=15 of Answer: x=15. IN TOTAL! 15×x=120. X=120:15 X=8,126: b=18 b=126:18 b=7 Y: 13=78 Y=78:13 Y=6 4×689×25=4×25×689=100×689=68900

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