A x 10^5 + 2a x 10^4 = 7200000 and a x 10^5 - a x 10^4 = 5400000

Find the value of a

60

Step-by-step explanation:

Looking at case 1.

a * 10^5 + 2a * 10 ^4 = 7200000

a * 10 * 10^4 + 2a * 10 ^4 = 7200000

[10a + 2a] * 10^4 = 7200000

12a = 7200000 / 10000

12a = 720

a = 720/12 = 60

Looking at case 2,

a * 10^5 - a * 10^4 = 5400000

a * 10 * 10^4 - a * 10^4 = 5400000

10a * 10^ 4 - a * 10^ 4 = 5400000

[10a - a] * 10^4 = 5400000

9a = 5400000/10000

9a = 540

a = 540/9

a = 60