If 9&4 = 50, 3&7 = -40 and 7&5 = 20, then ﬁnd the value of 4&5 = ?

Question 43

Solution

Given : 9&4 = 50, 3&7 = -40 and 7&5 = 20

If we replace '&' with '-', and multiply the difference by 10, we get the desired result.

Eg :- $$(9-4)\times10=50$$

and $$(3-7)\times10=-40$$ and $$(7-5)\times10=20$$

Similarly, $$(4-5)\times10=-10$$

=> Ans - (B)

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