"যদি 25 জন পুরুষ 10 দিনে 1000 টাকা আয় করে, তবে 15 জন পুরুষ 15 দিনে কত উপার্জন করবে?"

Four companies submitted the quotations for building a bridge, with the following values of breaking stress (B_(s)) and working stress (W_(s)) expressed in N//m^(2) (A) B_(s) = 25 xx 10^(8), W_(s) = 15 xx 10^(8) (B) B_(s) = 20 xx 10^(8), W_(s) = 15 xx 10^(8) (C ) B_(s) = 25 xx 10^(8), W_(s) = 12.5 xx 10^(8) (D) B_(s) = 25 xx 10^(8), W_(s) = 20 xx 10^(8) To whome the contract should be given, if all of them have quoted the same amount ?