Write three consecutive odd integers preceding $-39$

What is the total charge in an atom consisting $16$ protons and $18$ electrons?

A bird sitting on a branch $12 m$ above the ground descends $4 m$ to a branch below and then flies to a branch $2 m$ above it. What is the height of the bird above the ground in metres?

The temperature in the morning was $2°C$ below zero. The temperature rose $8°C$ by noon and then dropped $3°C$ by night. What was the temperature at night?

A newspaper reports the given changes (in $₹$) in the price of a stock over five days. $-2, -3, 6, -8, 2$. Find the mean daily change.

While returning to the gliderpart, Maya descended for three minutes at the rate of $100 m$ per minute. How much altitude did she lose? If her starting altitude was $728 m$, what was her final altitude?

A mountain is at a height of $8850 m$. Its base is at an elevation of $5450 m$. The temperature at the base is $-6°C$. If the temperature there drops at the rate of $1°C$ per $100$ metres, find the temperature at the top.

Simplify:

$21-12÷3\times 2$

Simplify:

$20+8÷4-2\times 3$