S + A = 450
$4S + $6A = $2340
S + A = 450
-6(S + A = 450)
-6S +-6A = -2700
4S + 6A = 2340
-2S = -360
-2S/-2 = -360/-2
S = 180
S + A = 450
180+ A =450
180-180 + A = 450-180
A = 270
Check
$4S + $6A = $2340
$4(180) + $6(270) = $2340
$720 + $1620 = $2340
$2340 = $2340
what are the answer choices
I hope this helps you
Thomas x age
Huilan 3x age
x+3x=112
4x=112
x=28
Do 96 divided by 6.
6 goes into 96 16 times. therefore, your answer is 16