A B amt 3500 x time 12 7 profit 3500*12 : 7x but ratio is given thus 3500*12 : 7x = 2:3 solving this we get x = 9000

if after adding 200 more wagers the total becomes 400 , they completed in 10 days (rest of the work) If those 200 are not added the wagers remain 200 i.e half of actual thus time taken will be double of actual i.e 20 days So 10 days extra

common terms are 24, 36 , 48 and so on upto 50 terms i.e upto 612 Sum = 50/2 ( 24+612) 15900

compound interest can be written as

400 400

32 ( 8% of 400 )

If there are 3 years then CI will be

400 400 400

32 32

32

2.56 (8% of 32) Hence differenc is 32+32+32+2.56 = 98.56

let x is length of his step Thus distance is = 6x Now, step length = x+3 And distance is = 5(x+3)

Equating these two We get x = 15 Length of slab = 6*15 == 90