Which proportion can be used to determine what number is 15% of 30? a. 15/30=x/100 b. 15/100= x/30 c. 15/100= x/30 d. 30/100=15/x which equation can be used to determine what number, n, is 40% of 64? a. (40)(64)=n b. 40÷64=n c. 0.40 (64)=n d. 64n=0.40 what number is 75% of 300 a. 36 b. 22.5 c. 2250 d. 225 28% of 80 is what number? a. 22.4 b. 2.24 c. 224 d. 24.4 which equation would provide the best estimate of 32% of 44.7? a. 1/3º40=n b. 2/3º45=n c. 1/3º45=n d. 2/3º44=n