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

(a) 325 km

(b) 350 km

(c) 405 km

(d) 340 km

**Solution:**

Given, 90% of x is 315 km

We have to find the value of x

90% of x = 315

(90/100) × x = 315

(9/10) × x = 315

x = 315 × 10/9

= 3150/9

= 350

Therefore, the value of x is 350

**✦ Try This: **If 70% of x is 690 km, then the value of x is

**☛ Also Check: **NCERT Solutions for Class 7 Maths Chapter 8

**NCERT Exemplar Class 7 Maths Chapter 7 Problem 18**

## If 90% of x is 315 km, then the value of x is (a) 325 km, (b) 350 km, (c) 405 km, (d) 340 km

**Summary:**

If 90% of x is 315 km, then the value of x is 350 km.

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