Question

state if 21:6 : : 35:10 are in proportion or not

Answer 1

If they are in proportion
it Must satisfy 21*10=35*6
As 21*10=210
35*6=210
They are in proportion

Answer 2

21:6::35:10 are in proportion or not, for check it first simplify.

so. 21:6::35:10
=21multiplied by 10 = 210
6 multiplied by 35= 210

21×10= 6×35
210= 210

yes,it is in proportion