Question

Que:28,29,30.pls pls if you only know answer. give opportunity to others ​​

Answer 1

Answer:

12

Step-by-step explanation:

28. Let the numbers at the ones place and the tens place be x and y respectively.

ATQ,

x+y = 3 ---- 1

Also,

10x + y + 9 = 10y + x

9x - 9y = -9

x- y = -1 ---- 2

On adding eq 1 and 2, we have,

2x= 2

x = 1

therefore,

1+ y = 3

y= 2

Thus,

the reqd number is 12.