Time and Work
Math MCQs

Question :    If Daniel can finish the work in 24 days and Timothy can finish the same work in 27 days, then in how many days both can finish the work together?

Correct Answer  12 ¹²/₁₇ days or 12.706 days

Solution & Explanation

Solution

Given,

The number of days to finish the work by Daniel = 24 days

And, the number of days to finish the same work by Timothy = 27 days

Thus, the number of days to finish the work by Daniel and Timothy together = ?

Here,

∵ In 24 days the work done by Daniel = 1

∴ In 1 day, the work done by Daniel = ¹/₂₄ part

Similarly,

∵ In 27 days the work done by Timothy = 1

∴ In 1 day, the work done by Timothy = ¹/₂₇ part

Now, in 1 day, the work done by Daniel and Timothy together

= In 1 day work done by Daniel + In 1 day the work done by Timothy

= ¹/₂₄ + ¹/₂₇

= ^{9 + 8}/₂₁₆

= ¹⁷/₂₁₆ part of work

This means in 1 day, ¹⁷/₂₁₆ part of work is done by Daniel and Timothy working together.

Now, the number of days required to finish ¹⁷/₂₁₆ part of work by Daniel + Timothy working together = 1

∴ the number of days required to finish 1 work by Daniel + Timothy together

= ¹/_¹⁷/216

= 1 × ²¹⁶/₁₇ = ²¹⁶/₁₇ days

= 12 ¹²/₁₇ days = or 12.706 days

Thus, Daniel and Timothy working together will finish the work in 12 ¹²/₁₇ days = or 12.706 days Answer

Shortcut Trick to solve the problems based on time and work using formula

Case: If A can finish a work in a days, and B can finish the same work in b days,
then working together the number of days require to finish the work
= ^{a × b}/_{a + b} days.

Here given,

The number of days required to finish the work by Daniel = 24 days

And the number of days required to finish the same work by Timothy = 27 days

Thus, the number of days required to finish the work Daniel and Timothy working together = ?

Here a = 24 days

And, b = 27 days

Thus, using formula ^{a × b}/_{a + b} days

The number of days required to finish the work when Daniel and Timothy working together

= ^{24 × 27}/_{24 + 27} days

= ⁶⁴⁸/₅₁ days

= ^{648 ÷ 3}/_{51 ÷ 3} = ²¹⁶/₁₇ days

= 12 ¹²/₁₇ days or 12.706

Thus, Daniel and Timothy together will finish the work in 12 ¹²/₁₇ days or 12.706 days Answer

Similar Questions

(1) If Ashley can finish the work in 36 days and Eric can finish the same work in 41 days, then in how many days both can finish the work together?

(2) If Timothy can finish the work in 53 days and Tyler can finish the same work in 58 days, then in how many days both can finish the work together?

(3) If James can finish the work in 2 days and John can finish the same work in 5 days, then in how many days both can finish the work together?

(4) If Richard can finish the work in 36 days and Mark can finish the same work in 52 days, then in how many days both can finish the work together?

(5) If Anthony can finish the work in 31 days and Jeffrey can finish the same work in 36 days, then in how many days both can finish the work together?

(6) Alexander can finish a work in 91 days. Patrick can finish the same work in 96 days while Raymond can finish the work in 101 days. How long will it take to finish it if they work together?

(7) If Joseph can finish the work in 19 days and Steven can finish the same work in 24 days, then in how many days both can finish the work together?

(8) Ashley can finish a work in 36 days. Emily can finish the same work in 41 days while Donna can finish the work in 46 days. How long will it take to finish it if they work together?

(9) Patricia can finish a work in 4 days. Jennifer can finish the same work in 5 days while Linda can finish the work in 6 days. How long will it take to finish it if they work together?

(10) If Paul can finish the work in 36 days and Larry can finish the same work in 39 days, then in how many days both can finish the work together?