Usha, Abir and Ratul are three brothers. Their father has divided Tk. 4200 amongst them. Thus Abir gets5 /3

parts of Usha and Usha gets1 /2
parts of Ratul.

a. If a : b = 4 : 5, b : c = 7 : 9, determine a : b : c.

b. Find the ratio of amount of Usha, Abir and Ratul.

c. Find How much taka Usha, Abir and Ratul have got?
(Pls i need this ans now)​

1 and 2

step-by-step explanation:

i you goofed up when writing this, because hnot is not a word minusf is not either. i cannot answer   because of that.

step-by-step explanation:

it would take 7/10 of an hour too fill the pool.

step-by-step explanation:

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)