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Ahmad has $1380 more than Ben at first. After each of them spent $640, Ahmad had 5 times as much money as Ben. How much did Ben have at first?

 Oct 4, 2021
 #1
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Initially

a = 1380 + b     

then

(a-640)  = 5 (b - 640)     sub in the red equation

(1380+b) - 640   = 5b - 3200

b = 985

 Oct 4, 2021
 #2
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5-1 = 4
$1380÷4 = $345

$345 + $640 = $985 (Ans)

 Oct 4, 2021

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