Find the least value of x which satisfies the equation $4x ≡ 7 (mod 9)$

Find the inter-quartile range of 1, 3, 4, 5, 8, 9, 10, 11, 12, 14, 16

An amount of ₦550,000.00 was realised when a principal, x was saved at 2% interest rate for 5 years. Find the value of x

Fati buys milk at ₦x per tin and sells each at a profit of ₦y. If she sells 10 tins of milk, how much does she receive from these sales?