中一數學-代數

1.y+y+40=450
2.3000/ab/3*2
u have some qu ask me!!!
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1. Let x be the money does Betty has.
x+40=430
請自行計算
so Betty has (the answer) dollars.

2. Let x be the money does A has.
3x+2x+x=3000
List the step.
answer:500

一數學-代數 1.Ann has $40 more than Betty. If they have $430 altogether,find the amount that Ann has.
Let......be y
2.$3000 is divided among A,B and C such that A has 3 times as much as C has 2 times as much as C has. How much does A have? === > 問題不清楚....
快快快吾該!!!
Let Ann has y
therefore, Betty = ( y - 40 )

Ann + Betty = $430
i.e. ( y ) + ( y - $40 ) = $430
==> 2 y = $430 + $40 = $470
==> y = $235 .( Ann has $235 and Betty has $195 )