Evaluate the unknown value — task. Mathematics CBSE, Class 7.

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Calculate the value of

$a$ if the angles

$∠M = ($ 3

$a+$ 5

$)°$ and

$N = (a+$ 10

$)°$ .

The value of

$a$ is .

[Note: Insert the value by rounding off it to maximum of

$2$ decimal places]

$1$

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