What will replace question mark?

If 1243=21, 2415=36, 3241=25, 4521=27 then 3542=?

The answer of 3542=48, if the given is 1243=21, 2415=36, 3241=25, 4521=27.

Step-by-step explanation:

The given is,

1243=21

2415=36,

3241=25,

4521=27

Step:1

For, 1243 = 21

Above is solved by,

(1+2) * (4+3) = 21

(3) * (7) = 21

21=21

For, 2415 = 36

Above is solved by,

(2+4) * (1+5) = 21

(6) * (6) = 36

36=36

For, 3241 = 25

Above is solved by,

(3+2) * (4+1) = 25

(5) * (5) = 25

25=25

For, 4521 = 27

Above is solved by,

(4+5) * (2+1) = 27

(9) * (3) = 27

27=27

For, 3542 = ?

Above is solved by,

= (3+5) * (4+2)

= (8) * (6)

3542=48

Result:

The answer of 3542=48, if the given is 1243=21, 2415=36, 3241=25, 4521=27.