22
25
23
8 hours 5 minutes.
The rule of the pattern 50 40 45 35 is subtract 10 then add 5.
22
25
23
By converting them to equivalent fractions with a common denominator. 1/5 = 7/35 1/7 = 5/35 1/5 - 1/7 = 2/35
4/7 - 2/5 = 6/35. To subtract (or add) fractions make both fractions equivalent fractions with the same denominator. The LCM (Lowest Common Multiple) of 7 and 5 is 35, so convert both the fractions to equivalent fractions out of 35: 4/7 = 20/35 2/5 = 14/35 The subtraction can now be done: 4/7 - 2/5 = 20/35 - 14/35 = 6/35
1/4
8 hours 5 minutes.
Change 5 3/5 to an improper fraction: 28/5Convert 7 to a fraction with a denominator of 5: 35/5Now subtract: 35/5 - 28/5 = 7/5
To get the correct answer. If you were adding 1/5 and 1/7, you might not know that the answer is 12/35 unless you knew that 1/5 = 7/35 and 1/7 = 5/35
The rule of the pattern 50 40 45 35 is subtract 10 then add 5.
Example: 1/5 + 2/7 Find the LCM of the denominators. The LCM of 5 and 7 is 35. Convert the original fractions to equivalent ones. 1/5 = 7/35 2/7 = 10/35 Add. 7/35 + 10/35 = 17/35 1/5 + 2/7 = 17/35
8X + 5 = 2X - 25 subtract 2X from each side 6X + 5 = -25 subtract 5 from both sides 6X = - 30 divide both sides by 6 X = - 30/6 I checked with my calculator, It checks -35 = -35