Priya and meena , alone can complete a sketch in 15 days and 20
days respectively. If they do sketching together for 4 days ,
then what is the amount (in units) of sketch left if the total
sketch is for 225 units?
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Priya can complete the sketch in 15 days
While Meena can complete the same sketch 20 days
That means:
1) Priya can do 1/15 of the sketch in 1 day
If the sketch is 225 units that means she can do 1/15 × 225 units = 15 units in 1 day
and in 4 days she can do = 15 units/ day × 4 = 60 units
2) Meena can do 1/20 of the sketch in 1 day
That is 1/20 of 225 = 1/20 × 225 = 11.25
And in 4 days she can do : 11.25 units/day × 4 = 45 units
Therefore the amount of sketch they can do in 4 days together:
= 60 units + 45 units = 105 units
This means the amount of sketch left:
= 225 units - 105 units = 120 units
The amount of sketch left = 120 units
While Meena can complete the same sketch 20 days
That means:
1) Priya can do 1/15 of the sketch in 1 day
If the sketch is 225 units that means she can do 1/15 × 225 units = 15 units in 1 day
and in 4 days she can do = 15 units/ day × 4 = 60 units
2) Meena can do 1/20 of the sketch in 1 day
That is 1/20 of 225 = 1/20 × 225 = 11.25
And in 4 days she can do : 11.25 units/day × 4 = 45 units
Therefore the amount of sketch they can do in 4 days together:
= 60 units + 45 units = 105 units
This means the amount of sketch left:
= 225 units - 105 units = 120 units
The amount of sketch left = 120 units
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