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 By: Strawberry (offline)  Friday, May 04 2012 @ 03:58 PM CDT (Read 1332 times)
Strawberry

help needed for this question

The ratio of Andy's mass to Bala's mass is 6:7. If Andy's mass increases by 5kg and Bala's mass decreases by 2kg, they will have the same mass. What is Andy's mass?

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Registered: 01/31/09
Posts: 83

 By: echeewh (offline)  Friday, May 04 2012 @ 06:02 PM CDT
echeewh

hey there,

Following pls find the worked solution:

Use Work Backwards technique and apply it to the <Before> and <After> model.

<After>
A : B
1 : 1

<Process>
A increases 5 kg; B decreases 2 kg;

Working backwards, we have ( A - 5 ) and ( B + 2 ).

Hence,

<After>

A |--------------|
**********|<-5-|
**<--6u-->

B |-------------|
**************|-2->|
**<-------7u------->

Applying Gap & Difference technique, we have...

7u - 6u --> 5 + 2
1u --> 7 kg

Mass of A = 6u --> 6 x 7 = 42kg

====================================

Trust this helps.

Cheers,
Edward

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Registered: 04/21/11
Posts: 627

 By: Strawberry (offline)  Friday, May 04 2012 @ 09:32 PM CDT
Strawberry

Thank you Edward

Regular Member

Registered: 01/31/09
Posts: 83

 By: kwekkl (offline)  Saturday, May 05 2012 @ 12:59 AM CDT
kwekkl

The ratio of the price of a ceiling fan to the price of a wall fan is 15:8
After a discount of \$5 on each item The ratio became 2:1
What was the original price of the ceiling fan?

Newbie

Registered: 02/10/09
Posts: 2

 By: fivetwo (offline)  Saturday, May 05 2012 @ 08:27 AM CDT
fivetwo

Original ratio - ceiling fan : wall fan
15:8

Both are reduced by \$5, and the ratio becomes 2:1 which is also 14:7.

Thus, 1u - \$5
15u - 5 / 1 * 15
= \$75 (Ans)

Newbie

Registered: 03/04/12
Posts: 1

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