1) 3751:62=60,5
пусть <em>х</em> коэф пропорциональности, то
1x + 3x = 40
4x = 40
x = 10
1x = 10
2x = 2 * 10 = 20
3x = 3 * 10 = 30
4x = 4 * 10 = 40
5x = 5 * 10 = 50