Currently, Sam's coach is twice as old as Sam. When Sam started soccer 10 years ago, his coach was four times his age. How old is Sam now?

Question

anonymous · Answer

show me how to do it and also show me the expression for how to find coach's age 10 years ago yhank you

anonymous · Answer

c = 4s but not exactly

anonymous · Answer

i know sam age is 15

anonymous · Answer

vut i dont know coacch expression for 10 years ago

anonymous · Answer

*but

anonymous · Answer

well 10 years ago same was 5, so you can use that too

anonymous · Answer

which means 10 years ago sam's coach was 20

anonymous · Answer

but I need the expression for coach

anonymous · Answer

20 = 4(15) - c
20 = 60 - c
-40 = -c  =>  40 = c

so, 20 = 4s - 40

anonymous · Answer

20 = 4s - c

anonymous · Answer

let age of sam = x
let age of his coach = y
calculate the value of x by using following equation
2x = y
4(x-10) = y