Answer:
Orginal Speed is 135
Step-by-step explanation:
The ratio of final speed: original speed is

We know that 90 km is it final speed so, we set up a proportion


Answer:
21
Step-by-step explanation:
average 9 pounds per three weeks
divide 9 in 3 three weeks
3 pounds per week
7 times 3 is 21
Answer:
1st equation is x=11
2nd equation is ???
Step-by-step explanation:
Answer:
420 hg = __4200000___ cg
Step-by-step explanation:
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