Answer:
100-mn
Step-by-step explanation:
He bought m books for n dollars each to know the amount of the books he bought,it means m×n=mn
He had $100 intially so to determine the amount left
100-the amount spent
100-mn
Therefore the answer is 100-mn
Answer:
16 deliveries in each hour
Step-by-step explanation:
1. 288 divided by 18 hours
2. 288 divided by 18 = 16
3. So in each hours she delivers 16 packages
The answer is 79.05 because 78.99* 6.25%
6.25%=0.0625
Number 1. <span>So the duck's OWN speed (if flying without any wind) with the wind behind him is:
Where x/10 is the wind speed
The duck's OWN speed (if flying without any wind) with the wind against him is:
Where x/10 is the wind speed Remember
So we have two equations that must equal each other since they both represent the duck's speed.
We need to rearrange to find x
Add x/10 to both sides and subtract (1600/10 from both sides gives:
so x must be 400/10 which 40 metres per minute.
Number 2. </span>let s=salmon and c=current <span>
upstream __ s-c=100m/20 min __ s-c=5m/min
downstream __ s+c=100m/8min __ s+c=12.5m/min
adding the two equations __ s-c+(s+c)=5+12.5 __ 2s=17.5 __ s=8.75m/min
substituting __ 8.75+c=12.5 __ c=3.75m/min</span>
