Question

Fill in the blanks.

(i) If 42 men can dig a trench in 14 days, then 1 man can dig it in ...... days.
(ii) If 15 oranges cost Rs 60, then 12 oranges cost Rs ...... .
(iii) If 10 metres of a uniform rod weighs 18 kg, then the weight of 6 metres of the rod is ...... kg.
(iv) If 12 workers finish a piece of work in 4 hours, then 15 workers will finish it in ..... hrs ..... min.

Answer 1

(i) 588 days
42 men can dig the trench in 14 days.
1 man can dig the trench in 14 $\times$ 42 days = 588 days

(ii) Rs. 48
15 oranges cost Rs 60.
12 oranges will cost Rs $\frac{60}{15}\times 12$ = Rs 48

(iii) 10.8 kg
A rod of length 10 m weighs 18 kg.
A rod of length 6 m will weigh $\frac{18}{10}\times 6$ = 10.8 kg

(iv) 3 h 12 min
12 workers finish the work in 4 h.
15 workers will finish the work in $\frac{4\times 12}{15}$ = 3.2 h = 3 h 12 min