Question
If A, B and C can do a work in 6 days, 9 days and 11
days, respectively, then, working together, how many days will they take to do the work?Solution
ATQ,
A's work rate: A completes the work in 6 days, so A does 1/6 of the work in 1 day. B's work rate: B completes the work in 9 days, so B does 1/9 of the work in 1 day. C's work rate: C completes the work in 11 days, so C does 11/11 of the work in 1 day. Combined work rate: Together, they complete: 
Find the combined rate : 
Time to complete the work : To complete 1 full work, the time taken is: 
 = or 2(52/73) days
Simplify the following expressionÂ
Â
`(256/6561)(1/4) = ?`
(60/15) × 25 + 15 2 – 18% of 200 = ? 2
[(7/8 of 640 - 60% of 300) × (√225 ÷ 5)] ÷ (1/4 of 800) = ?
25% of 60 × 15% of 120 = 30% of (?)
45% of 1020 + ?% of 960 = 747
- Find the simplified value of the given expression.
(-8) x {15 - (-4) x (-5)} (36/8)2 × (912/38) ÷ (122/1586) = ?
...5555 ÷ 11 ÷ 5 = 100 + ?
(30% of 400 - 20% of 540 + 35% of 1000) = ?
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