Question
"A" can finish a task in 36 days, while "B" can
complete it in 45 days. Both start working on the task together, but "A" stops working after "x" days. The entire task is completed in 30 days. Find the value of "x".Solution
Let, total amount of work = 180 units (LCM of 36 and 45) Efficiency of A = 180/36 = 5 units per day Efficiency of B = 180/45 = 4 units per day According to question; 9 × x + 4 × (30 – x) = 180 Or, 9x – 4x = 180 – 120 Or, 5x = 60 Or, x = 12
87 D 29 A 12 B 5 C 9 = ?
What will be the value of the given expression after the following interchanges?
Expression: 84 ÷ 11 - 15 X 14 + 75
Interchanges: Sign: '...
- If A # B means A + B, A $ B means A - B, A % B means A X B and A & B means A ÷ B, then what is the value of '52 # 45 $ 72 # 10 % 4 $ 60 & 15'?
A shopkeeper sells rice in such a way that the selling price of 950 gm is the same as the cost price of one kilogram. Find his gain percent.
If ‘+’ means ‘-’, ‘×’ means ‘+’, ‘-’ means ‘÷’ and ‘÷’ means ‘×’, then, what is the value of the following expressio...
Statements:
A < B ≥ C > U = W; R < Q > L ≤ W = Y; Q > P
Conclusions:
I. B < P
II. C > R
In a certain code of language, ‘+’ represents ‘×’, ‘-‘ represents ‘+’, ‘×’ represents ‘÷’ and ‘÷’ represents ‘-‘. Wh...
Select the correct combination of mathematical signs to sequentially replace the * signs and to balance the given equation.
30 * 4 * 2 * 1 * 121
If ‘#’ means ‘×’, ‘%’ means ‘+’, ‘^’ means ‘÷’ and ‘*’ means ‘-’, then the value of 36 % 8 * 5 # 4 ^ 2 is ___.
...Which two numbers should be interchanged to make the given equation correct?
620 + 75 ÷ 8 × 35 – 44 × 5 + 15 = 583
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