Răspuns:
5.a)
10%*150=10/100*150=15
12%*125=12/100*125=15
5%*240=5/100*240=12
15+15-12=18
b) 35%*160=35/100*160=7*8=56
24%*175=24/100*175=24/4*7=6*7=42
85%*180=85/100*180=85/25*45=17*9=153
56+42+153=251
c) 45%*220=45/100*220=9/20*220=9*11=99
36%*150=36/100*150=9/25*150=9*6=54
55%*360=55/100*360=11/20*360=11*18=198
99+54+198=351
6. 1/6*60=10 bomboane
10+2=12 bomboane a luat Maria
60-12=48 bomboane au ramas
48:2=24 bomboane
24+1=25 bomboane a luat Luca
60-(12+25)=60-37=23 bomboane au ramas in cutie
7. Notam cu "x" tot drumul
3/5*x+36=x
(3*x)/5+36/1=x/1
Aducem la acelasi numitor comun 5.
3x+36*5=5*x
5x-3x=36*5
2x=180
x=180:2
x=90 km are tot drumul
