Question

pls answer my question with an explanation

Answer 1

Answer:

a= 7/15= 0.4666

b= 11/21= 0.52

therefore b is much closer

Answer 2

A and B problem

First, sum A is $\dfrac{2}{15} +\dfrac{3}{15}$.

Second, sum B is $\dfrac{18}{21} -\dfrac{7}{21}$.

A is $\dfrac{1}{5}$. B is $\dfrac{11}{21}$.

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To find: Distance from 1/2

Solution: Use subtraction on number line.

Between A and 1/2, last one is greater. So distance will be $\dfrac{1}{2} -\dfrac{1}{5}$.

The distance to 1/2 is $\dfrac{3}{10}$.

Between B and 1/2, first one is greater. So distance will be $\dfrac{11}{21} -\dfrac{1}{2}$.

The distance to 1/2 is $\dfrac{1}{42}$.

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The distance $\dfrac{3}{10}$ from A is greater than B, $\dfrac{1}{42}$.

The grid problem

? × 5 × 2 = 1 → ? = 1/10

20 × 1 × ? = 1 → 1/20

1/2 × ? × 10 = 1 → ? = 1/5