Question

numai 3,4,5 vă rog!​

Answer 1

3. a+b=90

a=5×b

5b+b=90=>6b=90=>b=90:6=>b=15

a=90-15=75

4. x+y=63

x=8×y

8y+y=63=>9y=63=>y=7

x=63-7=56

5.biciclete+triciclete=48

triciclete=biciclete×2

2×biciclete+biciclete=48

3×biciclete=48=>biciclete=48:3=16

triciclete =16×2=32