Question

A mixture consists of 45 % sand, 36 1 % gravel and the rest is cement. Find the mass of mixture that contains 12.5 kg of sand and also the mass of mixture that will contain 4 kg of 11 cement.

wnt to be mi frnd
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Answer 1

Explanation:

Let the mixture be 100%

Quantity of sand in the mixture =

11

500

%

Quantity of gravel in the mixture =

11

400

%

Quantity of Cement in the mixture =100%−

11

500

%−

11

400

%

⇒

11

1100÷500−400

%

⇒

11

200

%

Let xKg of mixture contain 12.5Kg of sand

But 100% of mixture contains

11

500

% of sand

⇒

100%

x

=

11

500

%

12.5

⇒x=

500%

12.5×100%

×11Kg

=2.5×11kg

=27.5Kg

let yKg of mixture contain 4Kg of cement

But 100% of mixture contain

11

200

% discount

⇒

100%

y

=

11

200

%

4

y=22Kg