Two and a half + four and a fifth - one and a tenth + five and a twentieth - (one and a tenth + a quarter) + three 1. Two and one half + four and one fifth - one and three tenths + two fifths 2. Five and nine twentieth - (one and seven tenths + one fourth) + two thirds Do with recursive equation

Two and a half + four and a fifth - one and a tenth + five and a twentieth - (one and a tenth + a quarter) + three 1. Two and one half + four and one fifth - one and three tenths + two fifths 2. Five and nine twentieth - (one and seven tenths + one fourth) + two thirds Do with recursive equation

Two and one half + four and one fifth - one and three tenths + two fifths = 5 / 2 + 21 / 5-13 / 10 + 2 / 15 = 75 / 30 + 126 / 30-39 / 30 + 4 / 30 = (75 + 126-39 + 4) / 30 = 166 / 30 = 83 / 15 five and nine twentieth - (one and seven tenths + one fourth) + two thirds = 109 / 20 - (17 / 10 + 1 / 4) + 2 / 3 = 109 /

It is known that the ratio of Party A to Party B is two fifths to four fifths, and that of Party B to Party C is two-thirds to one-half
It is known that the ratio of a to B is two fifths to four fifths, the ratio of B to C is two-thirds to one-half, and the ratio of a to C is ()

A: B = 2 / 5:4 / 5 = 2:4
B: C = 2 / 3:1 / 2 = 4:3
A: C = 2:3

6.57 divided by 2 / 5 minus 75% divided by 2 / 5
Simple calculation

It's 6.75 divided by 2 / 5 minus 75% divided by 2 / 5
=(6.75-0.75) △ 2 / 5
=6 × 5 / 12
=Two and one in two

What's 15 divided by 75% is 6 to what's 6 times 7

15 ÷ (20) = 75% = 6: (8) = 7 / 6 × (9 / 14)