The expenditure on roads, schools and water supply are in the ratio 7:15:2. If the expenditure on roads is GH¢2,800.00. Find the expenditure on school, water supply and total expenditure

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870