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1420 = 2 × 2 × 5 × 71 = 22 × 51 × 711
No. of factors
= (2 + 1) × (1 + 1) × (1 + 1)
= 3 × 2 × 2 = 12
By the properties of secant,
ZT2 = ZY × ZX
⇒ 62 = 4 × (4 + x)
⇒ 4x + 16 = 36
⇒ 4x = 36 – 16 = 20
⇒ x = = 5
Total work of Shyam = 12 × 10 = 120 hours
Now, hours per day required in order to complete the work in 8 days
= = 15 hours
Let, the third proportion of 12 and 6√5 is x.
If 12, 6√5 and x will be in continuous proportion.
Then, 12/(6√5) = (6√5)/x
⇒ 12x = 6√5 × 6√5
= 12x = 36 × 5
⇒ x = 15
Mean proportional between 24 and 150 = = 60
∴ Required ratio = 60 : 15 = 4 : 1
We know that,
SP = CP + profit
According to question,
12 CP = 8 (CP + profit)
12 CP = 8 CP + 8 profit
4CP = 8 profit
Profit / CP = ½
Profit % = Profit/CP × 100 = ½ × 100 = 50%
Basic method : Let the six numbers be
Average =
∴
Let the removed number be
When the number is removed =
Alternate method : Removed number = 20×6 – 15×5 = 45.
Directions For Questions
Study the graph and answer the question.
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The expenditure as a percentage of salary is the least for:
Expenditure as a percentage of salary for A = = 50%
Expenditure as a percentage of salary for B = = 41.67%
Expenditure as a percentage of salary for C = = 37%
Expenditure as a percentage of salary for D = = 37.5%
Hence, expenditure as a percentage of salary is the least for C.
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