Four students contribute sum of money to a church in the ratio of 2:4:5:7. If the largest amount contributed is K4.20,find the total amount contributed by four people?

Let the amounts contributed by the four students be 2x, 4x, 5x, and 7x respectively.

Given that the largest amount contributed is K4.20, we have:

7x = K4.20
x = K4.20 / 7
x = K0.60

Therefore, the total amount contributed by the four students is:
2x + 4x + 5x + 7x = 18x
= 18 * K0.60
= K10.80

Therefore, the total amount contributed by the four students is K10.80.

Let the amounts contributed by four students be 2x,4x,5x and 7x respectively.

Given the largest amount contributed is K4.20,
7x = K4.20
x = K4.20/ 7 = K0.60

Total amount contributed by four people
= 2x + 4x + 5x + 7x
= 18x
= 18 - K0.60
=K10.80