Question 1134792
a certain concrete mixture contains 6.00% cement and 8.00% sand
 how many kilograms of sand should be combined with 255 kg of cement to make a 
 batch that is 14.0% cement and 16.0% sand?
: 
let x = the total amt of the concrete in this new mixture
14% of the new mixture equals 255 
.14x = 255
x = 255/.14
x = 1821.43 kg total weight of the concrete
:
Find the amt of sand in this concrete mixture
.16 * 1821.43 = 291.43 kg of Sand required