Question

Sand and cement are in the ratio 6:5 in the mixture weighing 671kg. How much sand must be added to the mixture so as to make the ratio 8:5?

Answer 1

Step-by-step explanation:

Let the ratio be 6x and 5x

=> 6x + 5x = 671

=> 11x = 671

=> x = 671/11

=> x = 61

=> 2x should be added to 6x to make it 8x.

=> 2x = 61x2 = 122

=> 122 kg sand should be added to make the ratio 8:5

Answer 2

Answer:

122 kg

Step-by-step explanation:

present amount of sand=671*6/11=366 kg

so cement=671-366=305 kg

Now let x kg sand is added to make 8:5

then ratio of sand and cement

=(x+366) / 305=8/5

5*(x+366)=8*305

5x+1830=2440

5x=2440-1830=610

x=610/5=122 kg