Question : Directions: In this question, some equations are solved on the same basis as a certain system. On the same basis, find out the correct answer out of the four alternatives for the unsolved equation.
If 12 × 16 = 188 and 14 × 18 = 248, then find the value of 16 × 20 = ?
Option 1: 320
Option 2: 360
Option 3: 316
Option 4: 318
Correct Answer: 316
Solution :
Given:
12 × 16 = 188 and 14 × 18 = 248
Like, 12 × 16 = 188→(12 × 16) – 4 = 192 – 4 = 188
And, 14 × 18 = 248→(14 × 18) – 4 = 252 – 4 = 248
Similarly, for 16 × 20 = ?→(16 × 20) – 4 = 320 – 4 = 316
Hence, the third option is correct.
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