Question

22 Apanya saves $5.95 daily. Find the least number of days in which she can save an exact number of rupees. Incomplee
23. Three strings of different lengths, 240 cm, 318 cm and 426 cm are to be cut into small pieces, each of equal length what is
greatest possible length of each piece that we can have, so that there is no wastage?
74. Two lighthouses flash their lights after every 20 s and 30 s respectively. Given that they flashed together at pum, when
They next flash together?​

Answer 1

Step-by-step explanation:

(22.)Least number of days she can save an exact number of dollars is 20. $5.95×20=>$119.

(23.)Find the H.C.F. of 240,318 and 426.

We know that all the numbers are divisible by 2 and 3. So all numbers are divisible by 6. Let's see if 12 can divide all numbers it can't as it leaves a remainder of 6 with both 318 and 426. Hence H.C.F. of 240,318 and 426 is 6. Greatest possible length of each piece that we can have without any wastage is 6cm.

(74.) find the l.c.m of 20 and 30.

2|20,30

5|10,15

2|2,3

3|1,3

|1,1 Hence the least common multiple of 20 and 30 is 2×5×2×3 =>60. They next flash together at 60s. Hope it helps you.