Question

of a point on a bicycle rim of diameter 24cm making 2800 revolutions per minute.
b) A man walks for xhours at a speed of (x + 1) km/h and cycles for (x - 1) hours at a speed of (2x + 5)km/h.
If the total distance travelled is 90km. Find x.
c) Coffee powder costing $15.75 per kg, is mixed with coffee powder costing $10.95 per kg in the ratio 6:9 by weight.
The mixture is sold at $15 per kg. Find the gain percent.
dl
Amanic

Answer 1

Answer:

Step-by-step explanation:

Let the beans be as follows 3x,5x,7x

ATQ 3x+5x+7x=45

15x=45

x=3

So weight of A=3*3=9 kg

Weight off B=5*3=15

Weight of C=7*3=21

Cost of A=7*9=63

Cost of B=15*10=150

Cost of C=21*13=273

Total =486/45=10.8