how many pounds of gravel that cost $2.50 per pound must be mixed with 6 pounds of cement that cost $1.50 per pound to make a mixture that cost $2.50 per pound?

(25 * 5.5) + (x * 2.9) + [(25 - x) * 4.4] = 50 * 4.5

Step-by-step explanation:

0.5 * 50Lbs. = 25 Lbs.

12.5 Lbs

12.5 Lbs.

(25 * 5.5) + (x * 2.9) + [(25 - x) * 4.4] = 50 * 4.5

1gm = 1000mg so 0.1gm = 1000mg

first, convert the weight to kg

160lb * 1kg/2.2lb = 72.7kg

next, the dose

72.7kg * 100mg/kg = 7270mg

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have