Adya and Ashley complete a work separately in 20 and 25 days respectively. After 10 days of their working together, they both left then Amber came and completed the remaining work in 3 days. If Amber alone would do the work, calculate how many days he would take to complete the work.?​

Number of days Adya took to complete the work = 20

Work done by Adya in 1 day =

Number of days Ashley took to complete the work = 25

Work done by Ashley in 1 day =

So,

Total work by Adya & Ashley in 1 day =

•°• Their total work in 10 days =

Now,

The work left to be completed =

From this we know that,

Amber completes of the work in 3 days.

So,

Time taken by Amber to complete the whole work =

↦ If Amber alone would do the whole work, he would take to complete it.

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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

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."