Question

Exercitiul 2..............

Answer 1

a + b + c =  680 
a + a x 50 :100 = a + a/2 =  3a/2
b - b x 25 : 100 = b - b/4 = 3b/4
c - 5
3a/2 = 3b/4 = c -5 = k
a = 2k/3
b = 4k/3
c = k+5

2k/3 + 4k/3 + k+5 = 680  / x3 
2k + 4k + 3k + 15 = 2040
9 k = 2040 -15
9k = 2025
k = 2025 : 9
k = 225
a = 2k/3 = (2 x 225):3 = 450 : 3 = 150
b = 4k/3 = (4 x 225):3= 900 : 3 = 300
c = k + 5 = 225 + 5 = 230

a =150
b = 300
c = 230
150 + 300 + 230 = 680