Question

a) 2×2×2×a=8 b) 8:4×b=10 c) 1000-d×2-25×4=800 d) c:(671-111×3×2)=70​

Answer 1

a) 2×2×2×a=8

8a=8 => a=1

b) 8:4×b=10

2×b=10=>b=5

c)1000-2d-25×4=800

1000-2d-100=800

900-2d=800

900=800+2d

=>2d=100=>d=50

d) c:(671-111×3×2)=70

c:(671-666)=70

c/5=70=>c=350