Asked by Olubunmi

A rectangular tank weighs 310kg,when it is half full of water and 450kg ,when it is three quarter full of water.What is the weight of the empty tank?
Answered by Reiny
weight of water when full --- x kg
weight of empty tank ------- y kg

(1/2)x + y = 310 **
(3/4)x + y = 450 ***

subtract: *** - **

(1/4)x = 140
x = 560

back in **
280 + y =310
y = 30

the tank weighs 30 kg
Answered by Chijioke
How did the 280 come about?
Answered by Moses
Substitute 560 into equation** I.e (1/2) × 560=280
Answered by SAEED MOHAMMED
The 560 and the 280 i dont really know how they come about
Answered by Anonymous
140×4=560

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