Question

An alloy consists of 30%, zinc 45% Nickel and the rest Copper. find the weight of copper in 800 gram of the alloy.

Answer 1

HEY DEAR ... ✌

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An alloy consists of 30% zinc , 45% nickel 
copper % = 100 - (30 % +45%) 
                = 100-75
               = 25%
weight copper = 25% of 800 g
                      = 1/4 * 800g
                      = 200g

HOPE , IT HELPS ... ✌

Answer 2

hye

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alloy consists of 30%zinc and  45% Nickel and the rest Copper

=>maximum = 100%

copper = 100%-[30%+45%]
               
              = 100% - 75%

               =25%

so there is 25%of copper in the   alloy

=>total weight of alloy = 800gram

so it is like there is 25%of copper in 800 gram

weight of alloy = 25% of 800g

                          = 25%*800g

                          =$\frac{25}{100} *800$

                          
=>$25*8$

=> 200 grams

the weight of copper in that alloy  is 200g