5 out of 14 * 9 out of 11 + 13 out of 14 * 5 out of 11

5 out of 14 * 9 out of 11 + 13 out of 14 * 5 out of 11

5 out of 14 * 9 out of 11 + 13 out of 14 * 5 out of 11,
=5 out of 14 * 9 out of 11 + 5 out of 14 * 13 out of 11
=5/14*（9/11+13/11）
=5/14*2
=5/7

The product of two numbers is 40%. One of them is exactly the reciprocal of the product. What is the other factor?

Let AB = 0.4, a = 1 / 0.4 = 2.5, then B = 4 / 25

The product of two numbers is 40%. One of the factors is exactly the reciprocal of the product. What is the other factor?

The reciprocal of the product is 1 / 40% = 5 / 2
40%÷（5/2）=4/25
Another factor is 4 out of 25