1000+ Maths Aptitude Test Questions and Answers Pdf - 1

Ans: D

(A + B)’s 1 day’s work = $${1}/{12}$$;

(B + C)’s 1’s day work = $${1}/{15}$$;

(A + C)’s 1’s day’s work = $${1}/{20}$$.

Adding, we get : 2 (A + B + C)’s 1 day’s work = $$({1/12} + {1/15} + {1/20})$$ = $${12}/{60}$$ = $${1}/{5}$$.

∴ (A + B + C)’s 1 day’s work = $${1}/{10}$$.

So, A, B and C together can complete the work in 10 days.

Ans: B

(A’s 1 day’s work) : (B’s 1 day’s work) = 2 : 1.

(A + B)’s 1 day’s work = $${1}/{18}$$

Divide $${1}/{18}$$ in the ratio 2 : 1.

∴ A’s 1 day’s work = $$({1/18} × {2/3})$$ = $${1}/{27}$$.

Hence, A alone can finish the work in 27 days.

Ans: D

Ratio of the work done by Sujit and Amit = 4 : 5

Total key depression done by Amit

= $${5}/{9} × 576000$$ = 3,20,000

Amit’s speed in key depression per hour = $${320000} / {8 × 5}$$ = 8000.

Ans: A

Time taken by B in completing the work = $$(12 × 100 / 160)$$ = $${15}/{2}$$ days.

∴ (A + B)’s 1 day’s work = $${1/12} + {2/15}$$ = $${5 + 8} / {60}$$ = $${13}/ {60}$$.

Hence the work will be completed in $${60}/{13}$$ days.

Ans: B

Required number of days = $$24{56}/{42}$$ = 32.