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1 cubic metre of concrete has a weight of 2400 kg.
15% of the concrete is water.
The rest of the ingredients of concrete are cement, sand and stone.
The weights of these ingredients are in the ratio 1:2:5
Work out the weight of cement, sand and stone in 1 cubic metre of concrete.

here is your mark brainliest

the correct answer is 1: 2

step-by-step explanation:

hope this your welcome : )

its an acute right triangle

step-by-step explanation:

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116