Question
Tina is 50% more efficient than Rina, and Mina is 30%
more efficient than Tina. If Mina and Tina together can do a piece of work in 12 days, in how many days will Rina complete the same work alone?Solution
ATQ, Let efficiency of Rina be ‘x’ units per day. Ratio of efficiency of Rina, Tina, and Mina = x: 1.5x: 1.95x = 100:150:195 Let total amount of work = (150 + 195) × 12 = 4140 units Time taken by Rina to complete the work = 4140/100 = 41.4 days
What is the value of (4ab+ab2)/(a2 b),  a,b ≠0
I. a + b = 0
II. a – b = 1
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