Simple Interest

Suppose P is the initial amount (which is lent, deposited, invested or principal), t is the time or tenure & r is rate of interest, then Simple Interest (SI) can be calculated as below: From the above formula, Principal (P), Rate (r) & Time (t) can be...

BODMAS

Step 1: Look for brackets and complete the calculations inside them, according bracket order: FIRST    SECOND    THIRD   Step 2: Look for any kind of roots (square roots, cube roots and others), indices (square of a number, cube of a number and others), exponents...

Upstream & Downstream

Upstream: Boat is moving against the direction of water. Suppose, u is the speed of boat in still water & v is the speed of stream, then: Upstream Speed (x) = (u-v)km/hr Downstream: Boat is moving along the direction of water. Suppose, u is the speed of boat in...