Question

ajutor va rog dau coroana pls si inima

Answer 1

14)
a+b=70
a=6b
6b+b=70
7b=70
b=70:7
b=10
a+10=70
a=70-10
a=60
Deci nr.sunt: 60 si 10

15) a+b=84
b=a:3
a=3b
3b+b=84
4b=84
b=84:4
b=21 pagini a citit a doua zi
a+21=84
a=84-21
a=63 pagini a citit in prima zi

16)
 a=bx4=4b
d=bx3=3b
a+b+d=80
4b+b+3b=80
8b=80
b=80:8=10 nicu are Bianca
a=4x10=40 nuci are Ana
d=3x10=30 nuci are Doina

17)  
a=carte
b=caiet
c=creion

a+b+c=45
a=3b
c=b:2
3b+b+b:2=45
4b+b:2=45 ( x cu 2)
8b+b=90
9b=90
b=90:9
b=10
a=3x10=30
c=10:2=5

30+10+5=45
 
18) 
f+b=80
f=b:3
b=3f
f+3f=80
4f=80
f=80:4
f=20 fete
b=3x20=60 baieti
60+20=80

19)
v+a+t=77
t=a:2
v=2a

2a+a+a:2=77 
3a+a:2=77 (x cu 2)
6a+a=154
7a=154
a=154:7
a=22 timbre are Adrian
t=22:2=11 timbre are Tudor
v=2x22=44 timbre are Vlad
20) a+b=99
a=8b
8b+b=99
9b=99
b=99:9
b=11 
a=8x11=88
21)
a+b=88
a:b=7
a=7b
7b+b=88
8b=88
b=88:8
b=11
a=7x11=77

a+b=77+11=88
a:b=77:11=7
22)
a+2a=60
3a=60
a=60:3
a=20