Question

Sarah weighs 30 more than 2 times as sheila. Together they weigh 150 kilograms. What is the wieght of each in grams

Answer 1

Sheila - 40kg
Sarah - 110kg

40 x 2 = 80
80 + 30 = 110

I used trial and error, starting with 50, to work this out. Here's what I did:

Sh x2 Sa Sh + Sa
50 100 130 180
45 90 120 165
40 80 110 150

Sh = Sheila
Sa = Sarah
Sh + Sa = Sheila + Sarah

Answer 2

assume Sheila weighs x,
so Sarah weighs 2x+30
together x+2x+30=150
remove 30 to the other side
3x=120
x=40
so Sheila weighs 40
and Sarah 2*40+30=110