**Answer **

**30%**

**Step-by-step explanation:**

21 is 70% of 30. 100-70= 30

The final probability is the weighted average of the playing probabilities calculated over the possible weather options:

P(john practices cello; given that it rains) * P(it rains) +

P(john practices cello; given that it does not rain) * P(it does not rain) =

0.6 * 0.7 + 0.4 * 0.3 = 0.54

The probability is 54%

**Answer:**

**Step-by-step explanation:**

Let the number is n.

ATQ,

The quotient of a number and two means n/2

Something is increased means plus.

It means,

**The required expression is : ****. Hence, this is the required solution.**

144

e

asd

s

d

sa

d

asd

as

d

as

da

sd

a

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