Question

Answer 1

\(a,x:7=920699:70\\x:7\times 70=920699\\ x:\left(7:70\right)=920699\\ x:0,1=920699\\ x=920699\times0,1\\ x=92069,9\)

\(b,5\times x-1952=2500-1947\\ 5\times x=2500-1947+1952\\ 5\times x=2500+\left(1952-1947\right)\\ 5\times x=2500+5\\ 5\times x=2505\\ x=2505:5\\ x=501\)

\(d,x\times1990-x=1999\times1997+1999\\ x\times\left(1990-1\right)=1999\times\left(1997+1\right)\\ x\times1989=1999\times1998\\ x=\dfrac{1999\times1998}{1989}\)

Answer 2

x:7=13152.84

x=13152.84x7

x=92069.9

Answer 3

a,92069.9

b,501

c,1997/1989