Question
The time taken by P to complete a
task is half of the time taken by Q. Q and R working together finish the task in 20 days, while P and R take 15 days. How long will P and Q together take to complete the task?Solution
ATQ, Let the total work be 60 units. {LCM (20 and 15)} Efficiency of Q + R = 60 ÷ 20 = 3 units/day Efficiency of P + R = 60 ÷ 15 = 4 units/day Let efficiencies be: Q = q, R = r P = 2q (because P works twice as fast) So, (q + r) = 3 ……… (i) (2q + r) = 4 ……… (ii) Subtracting (i) from (ii): q = 1 Efficiency of P = 2 × 1 = 2 units/day Required time = 60 ÷ (1 + 2) = 20 days
If 48 + 26 = 8
34 + 58 = 4
99 + 18 = 63
Find 87 + 56 = ?
Select the combination of letters that when sequentially placed in the blanks of the given letter series will complete the series.
m _ _ _ n o _ ...
RRHHHHH, RHRHHHH, RHHRHHH, RHHHRHH, RHHHHRH, _____________.
What will come in the place of question mark?
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a b c _ e _ g...
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G _ I _ K G H I _ K _ _ _ J K
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u _ v v v _ _ ...
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w w _ r r _...
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_ _ p q _ _ r _...
Select the option that represents the letter that, when placed from left to right will come in the blanks below, will complete the letter sequence corr...
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