How many ‘7' s are there in the following series which are not immediately followed by ‘3’ but immediately followed by ‘3 but immediately preceded by 8?

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If 3 ×4 = 25, 5 × 6 = 61, 6 × 7 = 85 then 9 × 10 = ?

If 20/Y = Y/45,what is the value of y?

The difference in selling price of a radio at gains of 10% and 15% is Rs. 80. Find the price of the radio.

What percentage is 1/8 ?

One fifth of a number exceeds its one seventh by 154. Find the number