If 90% of x is 315 km,

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Question:
If 90% of x is 315 km, then the value of x is

(a) 325 km

(b) 350 km

(c) 350 m

(d) 325 m

Solution:

(b) 350 km

Explanation: 90% of x is 315 km

90/100 × x = 315

X = 315 × 100/90 = 315 × 10/9 = 350