Tea Mixture problem

so you are given the ratio of mixture that is prepared from three varieties of tea

each ratio gives the amount in kg of that tea variety so we can say the ratio is as follows

x : x : 2x

Lets say the price of third variety is P
now total price / kg can be calculated as



126*x + 135*x + 2x*P / (x+x+2x)----(1)

x+x+2x represents the total weight

we know the mixtures price/kg = 153 --- (2)

from (1) and (2) we can get
126*x + 135*x + 2x*P / (x+x+2x) = 153
126+135 +2P = 4 * 153
261+2P = 612
P = 612-261 / 2
P = 175.5 (D) answer