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Time taken by A to complete the work = 32 days Time taken by B to complete to the work = 32 – 12 = 20 days Time taken by C to complete the work = 12/0.25 = 48 days Let the total work = 480 units Efficiency of A = 480/32 = 15 units/day Efficiency of B = 480/20 = 24 units/day Efficiency of C = 480/48 = 10 units/day Therefore, 1 days work of (A + B + C) = 15 + 24 + 10 = 49 units Therefore, required time taken = 0.6125 × 480/49 = 6 days
If x 2 – 15x + 51 = 0, then determine the value of (x – 5) + {1/(x – 5)}.
√(92×8 ×52+700) = ?
{(21/20) + (20/21)}2 - {(21/20) - (20/21)}2 = ?
In a college, the proportion of boys to girls is 7:9, and the proportion of graduate students to postgraduate students is 4:5. Determine the total numbe...
The average of three numbers a, b and c is 2 more than c. The average of a and b is 48. If d is 10 less than c, then the average of c and d is:
If a3 + b3 = 6240 and a + b = 30, then find the value of {(a + b)2 – 3ab}
If 15a2 + 1 = 20a, then find the value of {(9a2 + 1)/25a2}
1/3 + 1/15 + 1/35 + 1/63 + 1/99 = ?
In a class of 70 students and 25 teachers, each student got gifts that were 20% of total number of students and each teacher got gifts that were 10% of ...
