1. a + b = 307/35
a = 1/5 + b
1/5 + 2b = 307/35
2b = 300/35
b = 300/70
b = 30/7
a = 157/35
2. (2x - 2/9) / (32/90) = 230/9
2x - 2/9 = ( 230 * 32 ) / 810
2x - 2/9 = 736/81
2x = 754/81
x = 377/81
3 scrii tu datele..
1750 = 35y/54
y = ( 1750*54 )/ 35 = 2700 lei
2700/6 = 450 lei - in prima zi
( 5*2700 )/27 = 500 lei - in a doua zi