# Find number x for which equality a) is faithful to x+1/8=3/5 b) 1/3+x=5/12 c) x-3/20=1/5 d) x-3/7=4/21 e) 4/5-x=1/6 e) 5/8-x=1/3 OBYaSNIT

Vitaliy

398

It is necessary to reduce fractions to a common denominator a) x+1/8=3/5 Х = 3/5-1/8 X =24/40-5/40 X =19/40 b) 1/3+x=5/12 x = 5/12-1/3 X =5/12-4/12 X =1/12 c) x-3/20=1/5 x =1/5+3/20 X =4/20+3/20 X =7/20 d) x-3/7=4/21 x = 4/21+3/7 X =4/21+9/21 X =13/21 e) 4/5-x=1/6 x = 4/5-1/6 X = 24/30-5/30 X =19/30 e) 5/8-x=1/3 x =5/8-1/3 X =15/24-8/24 of X = 7/24A) 19/45 3/5 = 24/40, 1/8 = 5/40, 24/45 - 5/45 = 19/45 b) 1/12 1/3 = 4/12, 5/12 - 4/12 = 1/12 c) 7/20 1/5 = 4/20, 4/20 + 3/20 = 7/20 d) 13/21 3/7 = 9/21, 9/21 + 4/21 = 13/21 e) 19/30 4/5 = 24/30, 1/6 = 5/30, 24/30 - 5/30 = 19/30 e) 7/24 5/8 = 15/24, 1/3 = 8/15, 15/24 - 8/24 = 7/24

373

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