bob the builder in making 480kg of concrete mix Concrete is made by mi

1.	bob the builder in making 480kg of concrete mix Concrete is made by mixing cement, snad and gravel in the ratio of 1:3:4 how much sand does he need
Answer» He need 180 kg of sand. Step-by-step explanation: Given : Bob the BUILDER in MAKING 480 kg of concrete mix Concrete is made by mixing cement, sand and gravel in the ratio of 1:3:4. To FIND : How much sand does he need ? Solution : Let the ratio be 'x'. The AMOUNT of cement, sand and gravel in concrete mixture be x, 3x, 4X respectively. So, total mixture is 480 kg. i.e. $x+3x+4x=480$ $8x=480$ Divide both sides by 8. $x=60$ The amount of sand is 3x. So, $3\times 60=180$ Therefore, he need 180 kg of sand. #Learn more R:b =4:3. how much of r is to be added to get the ratio 4 :1 brainly.in/question/8032452