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4 over 5 is equal to 4 divided by 5 which equals 0.8. Multiply 0.8 by 7 which equals 5.6. Divide that by 1 over 7 which is 1 divided by 7 which equals0.142. So you divide 5.6 by 0.142 and the answer is 39.436 which is equivilent to 39.44.
7 to 2
5/7, 10/14, 15/21
Depending if the 5 is in the "over 20" or not. Because what you stated is unclear, it can be (5+7)/20 or 5+7/20, which is two different answers, 0.6 and 5.35.
5 over 7 = 5/7. Multiply both the numerator (top) and the denominator (bottom) of the fraction by any non-zero integer. You will have an equivalent fraction.