Question

help me with these questions​

Answer 1

Answer:

Step-by-step explanation:

Let tens digit of number is X

Unit. digit ....................Y

Number is 10X+Y

ATQ

8×(X+Y) -5 = 10X+Y.... 1st case

16 (X-Y) +3 = 10X+Y....2nd case

8X+8Y-10X-Y=5

-2X+7Y =5.......(1)

And

16X-16Y-10X-Y=-3

6X-17Y=-3......(2)

-2X+7Y=5 ......× 3

6X-17Y =-3......×1

-6X+21Y=15

6X -17Y=-3

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adding equation 1 and 2

4Y= 12

Y=12/4 =3

Putting value of Y in equation 1

-2X+7Y=5

-2X+ 21=5

-2X=-16

X=8

So the number is 8×10 +3 = 83

(◆2◆)

Let number of Blue balls is X

Red ball =3

Total = 3+X

Probability of drawing a blue ball is X/3+X

Probability of drawing a red ball is

3/ 3+X

ATQ

P of Blue ball = 4× P of Red ball

X/3+X = 4 × (3/ 3+X)

X= 12

So number of blue ball is 12.