1.6 Quant : Adaptation#GmatTheSeries

Workforce Problem

1/t1 + 1/t2 = 1/tb

t1 : time taken by 1st person
t2 : time taken by 2nd person
tb : time taken by both
* เป็น 1/t เพราะว่าเป็นการเอา 1 งานมาหารด้วย Rate ในการทำเสร็จ

For more workforce problem

Mixture

%amount1 + %amount2 = %amount final
Cost1*amount1 + Cost2*amount2 = Total Cost

Discount

Original Price * Discount Rate = Amount of Discount
Original Price -Discount = Sales Price

Original Price * 1-DiscountRate = Sales Price

Profit/ Loss

Sales price -Cost Price = Profit/Loss net

(Profit,Loss net/Cost)*100 = Profit/Loss%
100* Sales Price/ ( 100+ Profit/Loss%) = Cost