Question

please tell me who are intelligent in all subjects please answer this​

Answer 1

Answer:

1

Step-by-step explanation:

If we subtract 1 from each number then the remainders will be 7, 11, 17, 29 which are all prime numbers.

Answer 2

Answer:

3 is the number

Step-by-step explanation:

let the number be x

$\frac{8 - x}{12 - x} = \frac{18 - x}{30 - x}$

$(8 - x)(30 - x) = (12 - x)(18 - x)$

$240 - 30x - 8x + {x}^{2} = 216 - 18x - 12x + {x}^{2}$

eliminating x^2 from both side

$240 - 38x = 216 - 30x$

$38x - 30x = 240 - 216$

$8x = 24$

$x = 3$